some more lixer
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# Beer Song
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Recite the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.
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Note that not all verses are identical.
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```text
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99 bottles of beer on the wall, 99 bottles of beer.
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Take one down and pass it around, 98 bottles of beer on the wall.
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98 bottles of beer on the wall, 98 bottles of beer.
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Take one down and pass it around, 97 bottles of beer on the wall.
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97 bottles of beer on the wall, 97 bottles of beer.
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Take one down and pass it around, 96 bottles of beer on the wall.
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96 bottles of beer on the wall, 96 bottles of beer.
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Take one down and pass it around, 95 bottles of beer on the wall.
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95 bottles of beer on the wall, 95 bottles of beer.
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Take one down and pass it around, 94 bottles of beer on the wall.
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94 bottles of beer on the wall, 94 bottles of beer.
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Take one down and pass it around, 93 bottles of beer on the wall.
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93 bottles of beer on the wall, 93 bottles of beer.
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Take one down and pass it around, 92 bottles of beer on the wall.
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92 bottles of beer on the wall, 92 bottles of beer.
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Take one down and pass it around, 91 bottles of beer on the wall.
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91 bottles of beer on the wall, 91 bottles of beer.
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Take one down and pass it around, 90 bottles of beer on the wall.
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90 bottles of beer on the wall, 90 bottles of beer.
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Take one down and pass it around, 89 bottles of beer on the wall.
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89 bottles of beer on the wall, 89 bottles of beer.
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Take one down and pass it around, 88 bottles of beer on the wall.
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88 bottles of beer on the wall, 88 bottles of beer.
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Take one down and pass it around, 87 bottles of beer on the wall.
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87 bottles of beer on the wall, 87 bottles of beer.
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Take one down and pass it around, 86 bottles of beer on the wall.
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86 bottles of beer on the wall, 86 bottles of beer.
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Take one down and pass it around, 85 bottles of beer on the wall.
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85 bottles of beer on the wall, 85 bottles of beer.
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Take one down and pass it around, 84 bottles of beer on the wall.
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84 bottles of beer on the wall, 84 bottles of beer.
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Take one down and pass it around, 83 bottles of beer on the wall.
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83 bottles of beer on the wall, 83 bottles of beer.
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Take one down and pass it around, 82 bottles of beer on the wall.
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82 bottles of beer on the wall, 82 bottles of beer.
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Take one down and pass it around, 81 bottles of beer on the wall.
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81 bottles of beer on the wall, 81 bottles of beer.
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Take one down and pass it around, 80 bottles of beer on the wall.
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80 bottles of beer on the wall, 80 bottles of beer.
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Take one down and pass it around, 79 bottles of beer on the wall.
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79 bottles of beer on the wall, 79 bottles of beer.
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Take one down and pass it around, 78 bottles of beer on the wall.
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78 bottles of beer on the wall, 78 bottles of beer.
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Take one down and pass it around, 77 bottles of beer on the wall.
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77 bottles of beer on the wall, 77 bottles of beer.
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Take one down and pass it around, 76 bottles of beer on the wall.
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76 bottles of beer on the wall, 76 bottles of beer.
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Take one down and pass it around, 75 bottles of beer on the wall.
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75 bottles of beer on the wall, 75 bottles of beer.
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Take one down and pass it around, 74 bottles of beer on the wall.
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74 bottles of beer on the wall, 74 bottles of beer.
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Take one down and pass it around, 73 bottles of beer on the wall.
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73 bottles of beer on the wall, 73 bottles of beer.
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Take one down and pass it around, 72 bottles of beer on the wall.
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72 bottles of beer on the wall, 72 bottles of beer.
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Take one down and pass it around, 71 bottles of beer on the wall.
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71 bottles of beer on the wall, 71 bottles of beer.
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Take one down and pass it around, 70 bottles of beer on the wall.
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70 bottles of beer on the wall, 70 bottles of beer.
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Take one down and pass it around, 69 bottles of beer on the wall.
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69 bottles of beer on the wall, 69 bottles of beer.
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Take one down and pass it around, 68 bottles of beer on the wall.
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68 bottles of beer on the wall, 68 bottles of beer.
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Take one down and pass it around, 67 bottles of beer on the wall.
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67 bottles of beer on the wall, 67 bottles of beer.
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Take one down and pass it around, 66 bottles of beer on the wall.
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66 bottles of beer on the wall, 66 bottles of beer.
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Take one down and pass it around, 65 bottles of beer on the wall.
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65 bottles of beer on the wall, 65 bottles of beer.
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Take one down and pass it around, 64 bottles of beer on the wall.
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64 bottles of beer on the wall, 64 bottles of beer.
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Take one down and pass it around, 63 bottles of beer on the wall.
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63 bottles of beer on the wall, 63 bottles of beer.
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Take one down and pass it around, 62 bottles of beer on the wall.
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62 bottles of beer on the wall, 62 bottles of beer.
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Take one down and pass it around, 61 bottles of beer on the wall.
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61 bottles of beer on the wall, 61 bottles of beer.
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Take one down and pass it around, 60 bottles of beer on the wall.
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60 bottles of beer on the wall, 60 bottles of beer.
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Take one down and pass it around, 59 bottles of beer on the wall.
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59 bottles of beer on the wall, 59 bottles of beer.
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Take one down and pass it around, 58 bottles of beer on the wall.
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58 bottles of beer on the wall, 58 bottles of beer.
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Take one down and pass it around, 57 bottles of beer on the wall.
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57 bottles of beer on the wall, 57 bottles of beer.
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Take one down and pass it around, 56 bottles of beer on the wall.
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56 bottles of beer on the wall, 56 bottles of beer.
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Take one down and pass it around, 55 bottles of beer on the wall.
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55 bottles of beer on the wall, 55 bottles of beer.
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Take one down and pass it around, 54 bottles of beer on the wall.
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54 bottles of beer on the wall, 54 bottles of beer.
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Take one down and pass it around, 53 bottles of beer on the wall.
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53 bottles of beer on the wall, 53 bottles of beer.
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Take one down and pass it around, 52 bottles of beer on the wall.
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52 bottles of beer on the wall, 52 bottles of beer.
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Take one down and pass it around, 51 bottles of beer on the wall.
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51 bottles of beer on the wall, 51 bottles of beer.
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Take one down and pass it around, 50 bottles of beer on the wall.
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50 bottles of beer on the wall, 50 bottles of beer.
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Take one down and pass it around, 49 bottles of beer on the wall.
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49 bottles of beer on the wall, 49 bottles of beer.
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Take one down and pass it around, 48 bottles of beer on the wall.
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48 bottles of beer on the wall, 48 bottles of beer.
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Take one down and pass it around, 47 bottles of beer on the wall.
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47 bottles of beer on the wall, 47 bottles of beer.
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Take one down and pass it around, 46 bottles of beer on the wall.
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46 bottles of beer on the wall, 46 bottles of beer.
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Take one down and pass it around, 45 bottles of beer on the wall.
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45 bottles of beer on the wall, 45 bottles of beer.
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Take one down and pass it around, 44 bottles of beer on the wall.
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44 bottles of beer on the wall, 44 bottles of beer.
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Take one down and pass it around, 43 bottles of beer on the wall.
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43 bottles of beer on the wall, 43 bottles of beer.
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Take one down and pass it around, 42 bottles of beer on the wall.
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42 bottles of beer on the wall, 42 bottles of beer.
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Take one down and pass it around, 41 bottles of beer on the wall.
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41 bottles of beer on the wall, 41 bottles of beer.
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Take one down and pass it around, 40 bottles of beer on the wall.
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40 bottles of beer on the wall, 40 bottles of beer.
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Take one down and pass it around, 39 bottles of beer on the wall.
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39 bottles of beer on the wall, 39 bottles of beer.
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Take one down and pass it around, 38 bottles of beer on the wall.
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38 bottles of beer on the wall, 38 bottles of beer.
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Take one down and pass it around, 37 bottles of beer on the wall.
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37 bottles of beer on the wall, 37 bottles of beer.
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Take one down and pass it around, 36 bottles of beer on the wall.
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36 bottles of beer on the wall, 36 bottles of beer.
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Take one down and pass it around, 35 bottles of beer on the wall.
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35 bottles of beer on the wall, 35 bottles of beer.
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Take one down and pass it around, 34 bottles of beer on the wall.
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34 bottles of beer on the wall, 34 bottles of beer.
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Take one down and pass it around, 33 bottles of beer on the wall.
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33 bottles of beer on the wall, 33 bottles of beer.
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Take one down and pass it around, 32 bottles of beer on the wall.
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32 bottles of beer on the wall, 32 bottles of beer.
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Take one down and pass it around, 31 bottles of beer on the wall.
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31 bottles of beer on the wall, 31 bottles of beer.
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Take one down and pass it around, 30 bottles of beer on the wall.
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30 bottles of beer on the wall, 30 bottles of beer.
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Take one down and pass it around, 29 bottles of beer on the wall.
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29 bottles of beer on the wall, 29 bottles of beer.
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Take one down and pass it around, 28 bottles of beer on the wall.
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28 bottles of beer on the wall, 28 bottles of beer.
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Take one down and pass it around, 27 bottles of beer on the wall.
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27 bottles of beer on the wall, 27 bottles of beer.
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Take one down and pass it around, 26 bottles of beer on the wall.
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26 bottles of beer on the wall, 26 bottles of beer.
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Take one down and pass it around, 25 bottles of beer on the wall.
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25 bottles of beer on the wall, 25 bottles of beer.
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Take one down and pass it around, 24 bottles of beer on the wall.
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24 bottles of beer on the wall, 24 bottles of beer.
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Take one down and pass it around, 23 bottles of beer on the wall.
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23 bottles of beer on the wall, 23 bottles of beer.
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Take one down and pass it around, 22 bottles of beer on the wall.
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22 bottles of beer on the wall, 22 bottles of beer.
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Take one down and pass it around, 21 bottles of beer on the wall.
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21 bottles of beer on the wall, 21 bottles of beer.
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Take one down and pass it around, 20 bottles of beer on the wall.
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20 bottles of beer on the wall, 20 bottles of beer.
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Take one down and pass it around, 19 bottles of beer on the wall.
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19 bottles of beer on the wall, 19 bottles of beer.
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Take one down and pass it around, 18 bottles of beer on the wall.
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18 bottles of beer on the wall, 18 bottles of beer.
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Take one down and pass it around, 17 bottles of beer on the wall.
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17 bottles of beer on the wall, 17 bottles of beer.
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Take one down and pass it around, 16 bottles of beer on the wall.
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16 bottles of beer on the wall, 16 bottles of beer.
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Take one down and pass it around, 15 bottles of beer on the wall.
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15 bottles of beer on the wall, 15 bottles of beer.
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Take one down and pass it around, 14 bottles of beer on the wall.
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14 bottles of beer on the wall, 14 bottles of beer.
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Take one down and pass it around, 13 bottles of beer on the wall.
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13 bottles of beer on the wall, 13 bottles of beer.
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Take one down and pass it around, 12 bottles of beer on the wall.
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12 bottles of beer on the wall, 12 bottles of beer.
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Take one down and pass it around, 11 bottles of beer on the wall.
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11 bottles of beer on the wall, 11 bottles of beer.
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Take one down and pass it around, 10 bottles of beer on the wall.
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10 bottles of beer on the wall, 10 bottles of beer.
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Take one down and pass it around, 9 bottles of beer on the wall.
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9 bottles of beer on the wall, 9 bottles of beer.
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Take one down and pass it around, 8 bottles of beer on the wall.
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8 bottles of beer on the wall, 8 bottles of beer.
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Take one down and pass it around, 7 bottles of beer on the wall.
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7 bottles of beer on the wall, 7 bottles of beer.
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Take one down and pass it around, 6 bottles of beer on the wall.
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6 bottles of beer on the wall, 6 bottles of beer.
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Take one down and pass it around, 5 bottles of beer on the wall.
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5 bottles of beer on the wall, 5 bottles of beer.
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Take one down and pass it around, 4 bottles of beer on the wall.
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4 bottles of beer on the wall, 4 bottles of beer.
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Take one down and pass it around, 3 bottles of beer on the wall.
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3 bottles of beer on the wall, 3 bottles of beer.
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Take one down and pass it around, 2 bottles of beer on the wall.
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2 bottles of beer on the wall, 2 bottles of beer.
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Take one down and pass it around, 1 bottle of beer on the wall.
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1 bottle of beer on the wall, 1 bottle of beer.
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Take it down and pass it around, no more bottles of beer on the wall.
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No more bottles of beer on the wall, no more bottles of beer.
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Go to the store and buy some more, 99 bottles of beer on the wall.
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```
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## For bonus points
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Did you get the tests passing and the code clean? If you want to, these
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are some additional things you could try:
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* Remove as much duplication as you possibly can.
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* Optimize for readability, even if it means introducing duplication.
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* If you've removed all the duplication, do you have a lot of
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conditionals? Try replacing the conditionals with polymorphism, if it
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applies in this language. How readable is it?
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Then please share your thoughts in a comment on the submission. Did this
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experiment make the code better? Worse? Did you learn anything from it?
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## Running tests
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Execute the tests with:
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```bash
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$ elixir beer_song_test.exs
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```
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### Pending tests
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In the test suites, all but the first test have been skipped.
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Once you get a test passing, you can unskip the next one by
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commenting out the relevant `@tag :pending` with a `#` symbol.
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For example:
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```elixir
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# @tag :pending
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test "shouting" do
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assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
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end
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```
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Or, you can enable all the tests by commenting out the
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`ExUnit.configure` line in the test suite.
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```elixir
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# ExUnit.configure exclude: :pending, trace: true
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```
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For more detailed information about the Elixir track, please
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see the [help page](http://exercism.io/languages/elixir).
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## Source
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Learn to Program by Chris Pine [http://pine.fm/LearnToProgram/?Chapter=06](http://pine.fm/LearnToProgram/?Chapter=06)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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@ -0,0 +1,40 @@
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defmodule BeerSong do
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@doc """
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Get a single verse of the beer song
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"""
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@spec verse(integer) :: String.t()
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def verse(number) do
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"""
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#{String.capitalize(bottle_num(number))} of beer on the wall, #{bottle_num(number)} of beer.
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#{action(number)}, #{bottle_num(number - 1)} of beer on the wall.
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"""
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end
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defp bottle_num(num) do
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case num do
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1 -> "1 bottle"
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0 -> "no more bottles"
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n when n < 0 -> "99 bottles"
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_ -> "#{num} bottles"
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end
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end
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defp action(num) do
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if num == 0 do
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"Go to the store and buy some more"
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else
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article = if num == 1, do: "it", else: "one"
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"Take #{article} down and pass it around"
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end
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end
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@doc """
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Get the entire beer song for a given range of numbers of bottles.
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"""
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@spec lyrics(Range.t()) :: String.t()
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def lyrics(range \\ 99..0) do
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range
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|> Enum.map(&verse/1)
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|> Enum.join("\n")
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end
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end
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@ -0,0 +1,363 @@
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if !System.get_env("EXERCISM_TEST_EXAMPLES") do
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Code.load_file("beer_song.exs", __DIR__)
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end
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ExUnit.start()
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ExUnit.configure(trace: true)
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defmodule BeerSongTest do
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use ExUnit.Case
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test "getting the first verse (99 bottles)" do
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assert BeerSong.verse(99) == """
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99 bottles of beer on the wall, 99 bottles of beer.
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Take one down and pass it around, 98 bottles of beer on the wall.
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"""
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end
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@tag :pending
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test "getting the second verse (98 bottles)" do
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assert BeerSong.verse(98) == """
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98 bottles of beer on the wall, 98 bottles of beer.
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Take one down and pass it around, 97 bottles of beer on the wall.
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"""
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end
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@tag :pending
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test "getting just the penultimate verse" do
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assert BeerSong.verse(1) == """
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1 bottle of beer on the wall, 1 bottle of beer.
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Take it down and pass it around, no more bottles of beer on the wall.
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"""
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end
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@tag :pending
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test "getting just the last verse" do
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assert BeerSong.verse(0) == """
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No more bottles of beer on the wall, no more bottles of beer.
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Go to the store and buy some more, 99 bottles of beer on the wall.
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"""
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end
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@tag :pending
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test "getting the last 4 verses" do
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assert BeerSong.lyrics(3..0) == """
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3 bottles of beer on the wall, 3 bottles of beer.
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Take one down and pass it around, 2 bottles of beer on the wall.
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2 bottles of beer on the wall, 2 bottles of beer.
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Take one down and pass it around, 1 bottle of beer on the wall.
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1 bottle of beer on the wall, 1 bottle of beer.
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Take it down and pass it around, no more bottles of beer on the wall.
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No more bottles of beer on the wall, no more bottles of beer.
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Go to the store and buy some more, 99 bottles of beer on the wall.
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"""
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end
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@tag :pending
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test "getting the whole song" do
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assert BeerSong.lyrics() == """
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99 bottles of beer on the wall, 99 bottles of beer.
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Take one down and pass it around, 98 bottles of beer on the wall.
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98 bottles of beer on the wall, 98 bottles of beer.
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Take one down and pass it around, 97 bottles of beer on the wall.
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97 bottles of beer on the wall, 97 bottles of beer.
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Take one down and pass it around, 96 bottles of beer on the wall.
|
||||
|
||||
96 bottles of beer on the wall, 96 bottles of beer.
|
||||
Take one down and pass it around, 95 bottles of beer on the wall.
|
||||
|
||||
95 bottles of beer on the wall, 95 bottles of beer.
|
||||
Take one down and pass it around, 94 bottles of beer on the wall.
|
||||
|
||||
94 bottles of beer on the wall, 94 bottles of beer.
|
||||
Take one down and pass it around, 93 bottles of beer on the wall.
|
||||
|
||||
93 bottles of beer on the wall, 93 bottles of beer.
|
||||
Take one down and pass it around, 92 bottles of beer on the wall.
|
||||
|
||||
92 bottles of beer on the wall, 92 bottles of beer.
|
||||
Take one down and pass it around, 91 bottles of beer on the wall.
|
||||
|
||||
91 bottles of beer on the wall, 91 bottles of beer.
|
||||
Take one down and pass it around, 90 bottles of beer on the wall.
|
||||
|
||||
90 bottles of beer on the wall, 90 bottles of beer.
|
||||
Take one down and pass it around, 89 bottles of beer on the wall.
|
||||
|
||||
89 bottles of beer on the wall, 89 bottles of beer.
|
||||
Take one down and pass it around, 88 bottles of beer on the wall.
|
||||
|
||||
88 bottles of beer on the wall, 88 bottles of beer.
|
||||
Take one down and pass it around, 87 bottles of beer on the wall.
|
||||
|
||||
87 bottles of beer on the wall, 87 bottles of beer.
|
||||
Take one down and pass it around, 86 bottles of beer on the wall.
|
||||
|
||||
86 bottles of beer on the wall, 86 bottles of beer.
|
||||
Take one down and pass it around, 85 bottles of beer on the wall.
|
||||
|
||||
85 bottles of beer on the wall, 85 bottles of beer.
|
||||
Take one down and pass it around, 84 bottles of beer on the wall.
|
||||
|
||||
84 bottles of beer on the wall, 84 bottles of beer.
|
||||
Take one down and pass it around, 83 bottles of beer on the wall.
|
||||
|
||||
83 bottles of beer on the wall, 83 bottles of beer.
|
||||
Take one down and pass it around, 82 bottles of beer on the wall.
|
||||
|
||||
82 bottles of beer on the wall, 82 bottles of beer.
|
||||
Take one down and pass it around, 81 bottles of beer on the wall.
|
||||
|
||||
81 bottles of beer on the wall, 81 bottles of beer.
|
||||
Take one down and pass it around, 80 bottles of beer on the wall.
|
||||
|
||||
80 bottles of beer on the wall, 80 bottles of beer.
|
||||
Take one down and pass it around, 79 bottles of beer on the wall.
|
||||
|
||||
79 bottles of beer on the wall, 79 bottles of beer.
|
||||
Take one down and pass it around, 78 bottles of beer on the wall.
|
||||
|
||||
78 bottles of beer on the wall, 78 bottles of beer.
|
||||
Take one down and pass it around, 77 bottles of beer on the wall.
|
||||
|
||||
77 bottles of beer on the wall, 77 bottles of beer.
|
||||
Take one down and pass it around, 76 bottles of beer on the wall.
|
||||
|
||||
76 bottles of beer on the wall, 76 bottles of beer.
|
||||
Take one down and pass it around, 75 bottles of beer on the wall.
|
||||
|
||||
75 bottles of beer on the wall, 75 bottles of beer.
|
||||
Take one down and pass it around, 74 bottles of beer on the wall.
|
||||
|
||||
74 bottles of beer on the wall, 74 bottles of beer.
|
||||
Take one down and pass it around, 73 bottles of beer on the wall.
|
||||
|
||||
73 bottles of beer on the wall, 73 bottles of beer.
|
||||
Take one down and pass it around, 72 bottles of beer on the wall.
|
||||
|
||||
72 bottles of beer on the wall, 72 bottles of beer.
|
||||
Take one down and pass it around, 71 bottles of beer on the wall.
|
||||
|
||||
71 bottles of beer on the wall, 71 bottles of beer.
|
||||
Take one down and pass it around, 70 bottles of beer on the wall.
|
||||
|
||||
70 bottles of beer on the wall, 70 bottles of beer.
|
||||
Take one down and pass it around, 69 bottles of beer on the wall.
|
||||
|
||||
69 bottles of beer on the wall, 69 bottles of beer.
|
||||
Take one down and pass it around, 68 bottles of beer on the wall.
|
||||
|
||||
68 bottles of beer on the wall, 68 bottles of beer.
|
||||
Take one down and pass it around, 67 bottles of beer on the wall.
|
||||
|
||||
67 bottles of beer on the wall, 67 bottles of beer.
|
||||
Take one down and pass it around, 66 bottles of beer on the wall.
|
||||
|
||||
66 bottles of beer on the wall, 66 bottles of beer.
|
||||
Take one down and pass it around, 65 bottles of beer on the wall.
|
||||
|
||||
65 bottles of beer on the wall, 65 bottles of beer.
|
||||
Take one down and pass it around, 64 bottles of beer on the wall.
|
||||
|
||||
64 bottles of beer on the wall, 64 bottles of beer.
|
||||
Take one down and pass it around, 63 bottles of beer on the wall.
|
||||
|
||||
63 bottles of beer on the wall, 63 bottles of beer.
|
||||
Take one down and pass it around, 62 bottles of beer on the wall.
|
||||
|
||||
62 bottles of beer on the wall, 62 bottles of beer.
|
||||
Take one down and pass it around, 61 bottles of beer on the wall.
|
||||
|
||||
61 bottles of beer on the wall, 61 bottles of beer.
|
||||
Take one down and pass it around, 60 bottles of beer on the wall.
|
||||
|
||||
60 bottles of beer on the wall, 60 bottles of beer.
|
||||
Take one down and pass it around, 59 bottles of beer on the wall.
|
||||
|
||||
59 bottles of beer on the wall, 59 bottles of beer.
|
||||
Take one down and pass it around, 58 bottles of beer on the wall.
|
||||
|
||||
58 bottles of beer on the wall, 58 bottles of beer.
|
||||
Take one down and pass it around, 57 bottles of beer on the wall.
|
||||
|
||||
57 bottles of beer on the wall, 57 bottles of beer.
|
||||
Take one down and pass it around, 56 bottles of beer on the wall.
|
||||
|
||||
56 bottles of beer on the wall, 56 bottles of beer.
|
||||
Take one down and pass it around, 55 bottles of beer on the wall.
|
||||
|
||||
55 bottles of beer on the wall, 55 bottles of beer.
|
||||
Take one down and pass it around, 54 bottles of beer on the wall.
|
||||
|
||||
54 bottles of beer on the wall, 54 bottles of beer.
|
||||
Take one down and pass it around, 53 bottles of beer on the wall.
|
||||
|
||||
53 bottles of beer on the wall, 53 bottles of beer.
|
||||
Take one down and pass it around, 52 bottles of beer on the wall.
|
||||
|
||||
52 bottles of beer on the wall, 52 bottles of beer.
|
||||
Take one down and pass it around, 51 bottles of beer on the wall.
|
||||
|
||||
51 bottles of beer on the wall, 51 bottles of beer.
|
||||
Take one down and pass it around, 50 bottles of beer on the wall.
|
||||
|
||||
50 bottles of beer on the wall, 50 bottles of beer.
|
||||
Take one down and pass it around, 49 bottles of beer on the wall.
|
||||
|
||||
49 bottles of beer on the wall, 49 bottles of beer.
|
||||
Take one down and pass it around, 48 bottles of beer on the wall.
|
||||
|
||||
48 bottles of beer on the wall, 48 bottles of beer.
|
||||
Take one down and pass it around, 47 bottles of beer on the wall.
|
||||
|
||||
47 bottles of beer on the wall, 47 bottles of beer.
|
||||
Take one down and pass it around, 46 bottles of beer on the wall.
|
||||
|
||||
46 bottles of beer on the wall, 46 bottles of beer.
|
||||
Take one down and pass it around, 45 bottles of beer on the wall.
|
||||
|
||||
45 bottles of beer on the wall, 45 bottles of beer.
|
||||
Take one down and pass it around, 44 bottles of beer on the wall.
|
||||
|
||||
44 bottles of beer on the wall, 44 bottles of beer.
|
||||
Take one down and pass it around, 43 bottles of beer on the wall.
|
||||
|
||||
43 bottles of beer on the wall, 43 bottles of beer.
|
||||
Take one down and pass it around, 42 bottles of beer on the wall.
|
||||
|
||||
42 bottles of beer on the wall, 42 bottles of beer.
|
||||
Take one down and pass it around, 41 bottles of beer on the wall.
|
||||
|
||||
41 bottles of beer on the wall, 41 bottles of beer.
|
||||
Take one down and pass it around, 40 bottles of beer on the wall.
|
||||
|
||||
40 bottles of beer on the wall, 40 bottles of beer.
|
||||
Take one down and pass it around, 39 bottles of beer on the wall.
|
||||
|
||||
39 bottles of beer on the wall, 39 bottles of beer.
|
||||
Take one down and pass it around, 38 bottles of beer on the wall.
|
||||
|
||||
38 bottles of beer on the wall, 38 bottles of beer.
|
||||
Take one down and pass it around, 37 bottles of beer on the wall.
|
||||
|
||||
37 bottles of beer on the wall, 37 bottles of beer.
|
||||
Take one down and pass it around, 36 bottles of beer on the wall.
|
||||
|
||||
36 bottles of beer on the wall, 36 bottles of beer.
|
||||
Take one down and pass it around, 35 bottles of beer on the wall.
|
||||
|
||||
35 bottles of beer on the wall, 35 bottles of beer.
|
||||
Take one down and pass it around, 34 bottles of beer on the wall.
|
||||
|
||||
34 bottles of beer on the wall, 34 bottles of beer.
|
||||
Take one down and pass it around, 33 bottles of beer on the wall.
|
||||
|
||||
33 bottles of beer on the wall, 33 bottles of beer.
|
||||
Take one down and pass it around, 32 bottles of beer on the wall.
|
||||
|
||||
32 bottles of beer on the wall, 32 bottles of beer.
|
||||
Take one down and pass it around, 31 bottles of beer on the wall.
|
||||
|
||||
31 bottles of beer on the wall, 31 bottles of beer.
|
||||
Take one down and pass it around, 30 bottles of beer on the wall.
|
||||
|
||||
30 bottles of beer on the wall, 30 bottles of beer.
|
||||
Take one down and pass it around, 29 bottles of beer on the wall.
|
||||
|
||||
29 bottles of beer on the wall, 29 bottles of beer.
|
||||
Take one down and pass it around, 28 bottles of beer on the wall.
|
||||
|
||||
28 bottles of beer on the wall, 28 bottles of beer.
|
||||
Take one down and pass it around, 27 bottles of beer on the wall.
|
||||
|
||||
27 bottles of beer on the wall, 27 bottles of beer.
|
||||
Take one down and pass it around, 26 bottles of beer on the wall.
|
||||
|
||||
26 bottles of beer on the wall, 26 bottles of beer.
|
||||
Take one down and pass it around, 25 bottles of beer on the wall.
|
||||
|
||||
25 bottles of beer on the wall, 25 bottles of beer.
|
||||
Take one down and pass it around, 24 bottles of beer on the wall.
|
||||
|
||||
24 bottles of beer on the wall, 24 bottles of beer.
|
||||
Take one down and pass it around, 23 bottles of beer on the wall.
|
||||
|
||||
23 bottles of beer on the wall, 23 bottles of beer.
|
||||
Take one down and pass it around, 22 bottles of beer on the wall.
|
||||
|
||||
22 bottles of beer on the wall, 22 bottles of beer.
|
||||
Take one down and pass it around, 21 bottles of beer on the wall.
|
||||
|
||||
21 bottles of beer on the wall, 21 bottles of beer.
|
||||
Take one down and pass it around, 20 bottles of beer on the wall.
|
||||
|
||||
20 bottles of beer on the wall, 20 bottles of beer.
|
||||
Take one down and pass it around, 19 bottles of beer on the wall.
|
||||
|
||||
19 bottles of beer on the wall, 19 bottles of beer.
|
||||
Take one down and pass it around, 18 bottles of beer on the wall.
|
||||
|
||||
18 bottles of beer on the wall, 18 bottles of beer.
|
||||
Take one down and pass it around, 17 bottles of beer on the wall.
|
||||
|
||||
17 bottles of beer on the wall, 17 bottles of beer.
|
||||
Take one down and pass it around, 16 bottles of beer on the wall.
|
||||
|
||||
16 bottles of beer on the wall, 16 bottles of beer.
|
||||
Take one down and pass it around, 15 bottles of beer on the wall.
|
||||
|
||||
15 bottles of beer on the wall, 15 bottles of beer.
|
||||
Take one down and pass it around, 14 bottles of beer on the wall.
|
||||
|
||||
14 bottles of beer on the wall, 14 bottles of beer.
|
||||
Take one down and pass it around, 13 bottles of beer on the wall.
|
||||
|
||||
13 bottles of beer on the wall, 13 bottles of beer.
|
||||
Take one down and pass it around, 12 bottles of beer on the wall.
|
||||
|
||||
12 bottles of beer on the wall, 12 bottles of beer.
|
||||
Take one down and pass it around, 11 bottles of beer on the wall.
|
||||
|
||||
11 bottles of beer on the wall, 11 bottles of beer.
|
||||
Take one down and pass it around, 10 bottles of beer on the wall.
|
||||
|
||||
10 bottles of beer on the wall, 10 bottles of beer.
|
||||
Take one down and pass it around, 9 bottles of beer on the wall.
|
||||
|
||||
9 bottles of beer on the wall, 9 bottles of beer.
|
||||
Take one down and pass it around, 8 bottles of beer on the wall.
|
||||
|
||||
8 bottles of beer on the wall, 8 bottles of beer.
|
||||
Take one down and pass it around, 7 bottles of beer on the wall.
|
||||
|
||||
7 bottles of beer on the wall, 7 bottles of beer.
|
||||
Take one down and pass it around, 6 bottles of beer on the wall.
|
||||
|
||||
6 bottles of beer on the wall, 6 bottles of beer.
|
||||
Take one down and pass it around, 5 bottles of beer on the wall.
|
||||
|
||||
5 bottles of beer on the wall, 5 bottles of beer.
|
||||
Take one down and pass it around, 4 bottles of beer on the wall.
|
||||
|
||||
4 bottles of beer on the wall, 4 bottles of beer.
|
||||
Take one down and pass it around, 3 bottles of beer on the wall.
|
||||
|
||||
3 bottles of beer on the wall, 3 bottles of beer.
|
||||
Take one down and pass it around, 2 bottles of beer on the wall.
|
||||
|
||||
2 bottles of beer on the wall, 2 bottles of beer.
|
||||
Take one down and pass it around, 1 bottle of beer on the wall.
|
||||
|
||||
1 bottle of beer on the wall, 1 bottle of beer.
|
||||
Take it down and pass it around, no more bottles of beer on the wall.
|
||||
|
||||
No more bottles of beer on the wall, no more bottles of beer.
|
||||
Go to the store and buy some more, 99 bottles of beer on the wall.
|
||||
"""
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,76 @@
|
|||
# Grade School
|
||||
|
||||
Given students' names along with the grade that they are in, create a roster
|
||||
for the school.
|
||||
|
||||
In the end, you should be able to:
|
||||
|
||||
- Add a student's name to the roster for a grade
|
||||
- "Add Jim to grade 2."
|
||||
- "OK."
|
||||
- Get a list of all students enrolled in a grade
|
||||
- "Which students are in grade 2?"
|
||||
- "We've only got Jim just now."
|
||||
- Get a sorted list of all students in all grades. Grades should sort
|
||||
as 1, 2, 3, etc., and students within a grade should be sorted
|
||||
alphabetically by name.
|
||||
- "Who all is enrolled in school right now?"
|
||||
- "Grade 1: Anna, Barb, and Charlie. Grade 2: Alex, Peter, and Zoe.
|
||||
Grade 3…"
|
||||
|
||||
Note that all our students only have one name. (It's a small town, what
|
||||
do you want?)
|
||||
|
||||
## For bonus points
|
||||
|
||||
Did you get the tests passing and the code clean? If you want to, these
|
||||
are some additional things you could try:
|
||||
|
||||
- If you're working in a language with mutable data structures and your
|
||||
implementation allows outside code to mutate the school's internal DB
|
||||
directly, see if you can prevent this. Feel free to introduce additional
|
||||
tests.
|
||||
|
||||
Then please share your thoughts in a comment on the submission. Did this
|
||||
experiment make the code better? Worse? Did you learn anything from it?
|
||||
|
||||
## Running tests
|
||||
|
||||
Execute the tests with:
|
||||
|
||||
```bash
|
||||
$ elixir grade_school_test.exs
|
||||
```
|
||||
|
||||
### Pending tests
|
||||
|
||||
In the test suites, all but the first test have been skipped.
|
||||
|
||||
Once you get a test passing, you can unskip the next one by
|
||||
commenting out the relevant `@tag :pending` with a `#` symbol.
|
||||
|
||||
For example:
|
||||
|
||||
```elixir
|
||||
# @tag :pending
|
||||
test "shouting" do
|
||||
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
|
||||
end
|
||||
```
|
||||
|
||||
Or, you can enable all the tests by commenting out the
|
||||
`ExUnit.configure` line in the test suite.
|
||||
|
||||
```elixir
|
||||
# ExUnit.configure exclude: :pending, trace: true
|
||||
```
|
||||
|
||||
For more detailed information about the Elixir track, please
|
||||
see the [help page](http://exercism.io/languages/elixir).
|
||||
|
||||
## Source
|
||||
|
||||
A pairing session with Phil Battos at gSchool [http://gschool.it](http://gschool.it)
|
||||
|
||||
## Submitting Incomplete Solutions
|
||||
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
|
||||
|
|
@ -0,0 +1,75 @@
|
|||
if !System.get_env("EXERCISM_TEST_EXAMPLES") do
|
||||
Code.load_file("school.exs", __DIR__)
|
||||
end
|
||||
|
||||
ExUnit.start()
|
||||
ExUnit.configure(trace: true)
|
||||
|
||||
defmodule SchoolTest do
|
||||
use ExUnit.Case
|
||||
|
||||
@db %{}
|
||||
|
||||
test "add student" do
|
||||
actual = School.add(@db, "Aimee", 2)
|
||||
assert actual == %{2 => ["Aimee"]}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "add more students in same class" do
|
||||
actual =
|
||||
@db
|
||||
|> School.add("James", 2)
|
||||
|> School.add("Blair", 2)
|
||||
|> School.add("Paul", 2)
|
||||
|
||||
assert Enum.sort(actual[2]) == ["Blair", "James", "Paul"]
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "add students to different grades" do
|
||||
actual =
|
||||
@db
|
||||
|> School.add("Chelsea", 3)
|
||||
|> School.add("Logan", 7)
|
||||
|
||||
assert actual == %{3 => ["Chelsea"], 7 => ["Logan"]}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "get students in a grade" do
|
||||
actual =
|
||||
@db
|
||||
|> School.add("Bradley", 5)
|
||||
|> School.add("Franklin", 5)
|
||||
|> School.add("Jeff", 1)
|
||||
|> School.grade(5)
|
||||
|
||||
assert Enum.sort(actual) == ["Bradley", "Franklin"]
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "get students in a non existent grade" do
|
||||
assert [] == School.grade(@db, 1)
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "sort school by grade and by student name" do
|
||||
actual =
|
||||
@db
|
||||
|> School.add("Bart", 4)
|
||||
|> School.add("Jennifer", 4)
|
||||
|> School.add("Christopher", 4)
|
||||
|> School.add("Kareem", 6)
|
||||
|> School.add("Kyle", 3)
|
||||
|> School.sort()
|
||||
|
||||
expected = [
|
||||
{3, ["Kyle"]},
|
||||
{4, ["Bart", "Christopher", "Jennifer"]},
|
||||
{6, ["Kareem"]}
|
||||
]
|
||||
|
||||
assert expected == actual
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
defmodule School do
|
||||
@moduledoc """
|
||||
Simulate students in a school.
|
||||
|
||||
Each student is in a grade.
|
||||
"""
|
||||
|
||||
@doc """
|
||||
Add a student to a particular grade in school.
|
||||
"""
|
||||
@spec add(map, String.t(), integer) :: map
|
||||
def add(db, name, grade) do
|
||||
end
|
||||
|
||||
@doc """
|
||||
Return the names of the students in a particular grade.
|
||||
"""
|
||||
@spec grade(map, integer) :: [String.t()]
|
||||
def grade(db, grade) do
|
||||
end
|
||||
|
||||
@doc """
|
||||
Sorts the school by grade and name.
|
||||
"""
|
||||
@spec sort(map) :: [{integer, [String.t()]}]
|
||||
def sort(db) do
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
# Isogram
|
||||
|
||||
Determine if a word or phrase is an isogram.
|
||||
|
||||
An isogram (also known as a "nonpattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.
|
||||
|
||||
Examples of isograms:
|
||||
|
||||
- lumberjacks
|
||||
- background
|
||||
- downstream
|
||||
- six-year-old
|
||||
|
||||
The word *isograms*, however, is not an isogram, because the s repeats.
|
||||
|
||||
## Running tests
|
||||
|
||||
Execute the tests with:
|
||||
|
||||
```bash
|
||||
$ elixir isogram_test.exs
|
||||
```
|
||||
|
||||
### Pending tests
|
||||
|
||||
In the test suites, all but the first test have been skipped.
|
||||
|
||||
Once you get a test passing, you can unskip the next one by
|
||||
commenting out the relevant `@tag :pending` with a `#` symbol.
|
||||
|
||||
For example:
|
||||
|
||||
```elixir
|
||||
# @tag :pending
|
||||
test "shouting" do
|
||||
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
|
||||
end
|
||||
```
|
||||
|
||||
Or, you can enable all the tests by commenting out the
|
||||
`ExUnit.configure` line in the test suite.
|
||||
|
||||
```elixir
|
||||
# ExUnit.configure exclude: :pending, trace: true
|
||||
```
|
||||
|
||||
For more detailed information about the Elixir track, please
|
||||
see the [help page](http://exercism.io/languages/elixir).
|
||||
|
||||
## Source
|
||||
|
||||
Wikipedia [https://en.wikipedia.org/wiki/Isogram](https://en.wikipedia.org/wiki/Isogram)
|
||||
|
||||
## Submitting Incomplete Solutions
|
||||
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
defmodule Isogram do
|
||||
@doc """
|
||||
Determines if a word or sentence is an isogram
|
||||
"""
|
||||
@spec isogram?(String.t()) :: boolean
|
||||
def isogram?(sentence) do
|
||||
letters = Regex.scan(~r/[a-z]/, String.downcase(sentence))
|
||||
Enum.uniq(letters) == letters
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
if !System.get_env("EXERCISM_TEST_EXAMPLES") do
|
||||
Code.load_file("isogram.exs", __DIR__)
|
||||
end
|
||||
|
||||
ExUnit.start()
|
||||
ExUnit.configure(trace: true)
|
||||
|
||||
defmodule IsogramTest do
|
||||
use ExUnit.Case
|
||||
|
||||
test "isogram lowercase" do
|
||||
assert Isogram.isogram?("subdermatoglyphic")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "not isogram lowercase " do
|
||||
refute Isogram.isogram?("eleven")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isogram uppercase" do
|
||||
assert Isogram.isogram?("DEMONSTRABLY")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "not isogram uppercase" do
|
||||
refute Isogram.isogram?("ALPHABET")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isogram with dash" do
|
||||
assert Isogram.isogram?("hjelmqvist-gryb-zock-pfund-wax")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "not isogram with dash" do
|
||||
refute Isogram.isogram?("twenty-five")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "phrase is isogram" do
|
||||
assert Isogram.isogram?("emily jung schwartzkopf")
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "phrase is not isogram" do
|
||||
refute Isogram.isogram?("the quick brown fox")
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,64 @@
|
|||
# Triangle
|
||||
|
||||
Determine if a triangle is equilateral, isosceles, or scalene.
|
||||
|
||||
An _equilateral_ triangle has all three sides the same length.
|
||||
|
||||
An _isosceles_ triangle has at least two sides the same length. (It is sometimes
|
||||
specified as having exactly two sides the same length, but for the purposes of
|
||||
this exercise we'll say at least two.)
|
||||
|
||||
A _scalene_ triangle has all sides of different lengths.
|
||||
|
||||
## Note
|
||||
|
||||
For a shape to be a triangle at all, all sides have to be of length > 0, and
|
||||
the sum of the lengths of any two sides must be greater than or equal to the
|
||||
length of the third side. See [Triangle Inequality](https://en.wikipedia.org/wiki/Triangle_inequality).
|
||||
|
||||
## Dig Deeper
|
||||
|
||||
The case where the sum of the lengths of two sides _equals_ that of the
|
||||
third is known as a _degenerate_ triangle - it has zero area and looks like
|
||||
a single line. Feel free to add your own code/tests to check for degenerate triangles.
|
||||
|
||||
## Running tests
|
||||
|
||||
Execute the tests with:
|
||||
|
||||
```bash
|
||||
$ elixir triangle_test.exs
|
||||
```
|
||||
|
||||
### Pending tests
|
||||
|
||||
In the test suites, all but the first test have been skipped.
|
||||
|
||||
Once you get a test passing, you can unskip the next one by
|
||||
commenting out the relevant `@tag :pending` with a `#` symbol.
|
||||
|
||||
For example:
|
||||
|
||||
```elixir
|
||||
# @tag :pending
|
||||
test "shouting" do
|
||||
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
|
||||
end
|
||||
```
|
||||
|
||||
Or, you can enable all the tests by commenting out the
|
||||
`ExUnit.configure` line in the test suite.
|
||||
|
||||
```elixir
|
||||
# ExUnit.configure exclude: :pending, trace: true
|
||||
```
|
||||
|
||||
For more detailed information about the Elixir track, please
|
||||
see the [help page](http://exercism.io/languages/elixir).
|
||||
|
||||
## Source
|
||||
|
||||
The Ruby Koans triangle project, parts 1 & 2 [http://rubykoans.com](http://rubykoans.com)
|
||||
|
||||
## Submitting Incomplete Solutions
|
||||
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
defmodule Triangle do
|
||||
@type kind :: :equilateral | :isosceles | :scalene
|
||||
|
||||
@doc """
|
||||
Return the kind of triangle of a triangle with 'a', 'b' and 'c' as lengths.
|
||||
"""
|
||||
@spec kind(number, number, number) :: {:ok, kind} | {:error, String.t()}
|
||||
def kind(a, b, c) when a <= 0 or b <= 0 or c <= 0 do
|
||||
{:error, "all side lengths must be positive"}
|
||||
end
|
||||
|
||||
def kind(a, b, c) when a + b <= c or b + c <= a or c + a <= b do
|
||||
{:error, "side lengths violate triangle inequality"}
|
||||
end
|
||||
|
||||
def kind(a, b, c) do
|
||||
cond do
|
||||
a == b && b == c ->
|
||||
{:ok, :equilateral}
|
||||
|
||||
a == b || b == c || a == c ->
|
||||
{:ok, :isosceles}
|
||||
|
||||
true ->
|
||||
{:ok, :scalene}
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -0,0 +1,85 @@
|
|||
if !System.get_env("EXERCISM_TEST_EXAMPLES") do
|
||||
Code.load_file("triangle.exs", __DIR__)
|
||||
end
|
||||
|
||||
ExUnit.start()
|
||||
ExUnit.configure(trace: true)
|
||||
|
||||
defmodule TriangleTest do
|
||||
use ExUnit.Case
|
||||
|
||||
# @tag :pending
|
||||
test "equilateral triangles have equal sides" do
|
||||
assert Triangle.kind(2, 2, 2) == {:ok, :equilateral}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "larger equilateral triangles also have equal sides" do
|
||||
assert Triangle.kind(10, 10, 10) == {:ok, :equilateral}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isosceles triangles have last two sides equal" do
|
||||
assert Triangle.kind(3, 4, 4) == {:ok, :isosceles}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isosceles triangles have first and last sides equal" do
|
||||
assert Triangle.kind(4, 3, 4) == {:ok, :isosceles}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isosceles triangles have two first sides equal" do
|
||||
assert Triangle.kind(4, 4, 3) == {:ok, :isosceles}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "isosceles triangles have in fact exactly two sides equal" do
|
||||
assert Triangle.kind(10, 10, 2) == {:ok, :isosceles}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "scalene triangles have no equal sides" do
|
||||
assert Triangle.kind(3, 4, 5) == {:ok, :scalene}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "scalene triangles have no equal sides at a larger scale too" do
|
||||
assert Triangle.kind(10, 11, 12) == {:ok, :scalene}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "scalene triangles have no equal sides in descending order either" do
|
||||
assert Triangle.kind(5, 4, 2) == {:ok, :scalene}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "very small triangles are legal" do
|
||||
assert Triangle.kind(0.4, 0.6, 0.3) == {:ok, :scalene}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "triangles with no size are illegal" do
|
||||
assert Triangle.kind(0, 0, 0) == {:error, "all side lengths must be positive"}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "triangles with negative sides are illegal" do
|
||||
assert Triangle.kind(3, 4, -5) == {:error, "all side lengths must be positive"}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "triangles violating triangle inequality are illegal" do
|
||||
assert Triangle.kind(1, 1, 3) == {:error, "side lengths violate triangle inequality"}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "triangles violating triangle inequality are illegal 2" do
|
||||
assert Triangle.kind(2, 4, 2) == {:error, "side lengths violate triangle inequality"}
|
||||
end
|
||||
|
||||
@tag :pending
|
||||
test "triangles violating triangle inequality are illegal 3" do
|
||||
assert Triangle.kind(7, 3, 2) == {:error, "side lengths violate triangle inequality"}
|
||||
end
|
||||
end
|
||||
Loading…
Reference in New Issue