# Secret Handshake

> There are 10 types of people in the world: Those who understand
> binary, and those who don't.

You and your fellow cohort of those in the "know" when it comes to
binary decide to come up with a secret "handshake".

```text
1 = wink
10 = double blink
100 = close your eyes
1000 = jump


10000 = Reverse the order of the operations in the secret handshake.
```

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Here's a couple of examples:

Given the input 3, the function would return the array
["wink", "double blink"] because 3 is 11 in binary.

Given the input 19, the function would return the array
["double blink", "wink"] because 19 is 10011 in binary.
Notice that the addition of 16 (10000 in binary)
has caused the array to be reversed.

use Bitwise (or div/rem)

If you use Bitwise, an easy way to see if a particular bit is set is to compare
the binary AND (`&&&`) of a set of bits with the particular bit pattern you
want to check, and determine if the result is the same as the pattern you're
checking.

Example:

Flags: 0b11011
Check: 0b11010

Flags &&& Check: 0b11010 (All checked bits are set)

Another:

Flags: 0b11011
Check: 0b10110

Flags &&& Check: 0b10010 (Third bit not set)


## Running tests

Execute the tests with:

```bash
$ elixir secret_handshake_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

Bert, in Mary Poppins [http://www.imdb.com/title/tt0058331/quotes/qt0437047](http://www.imdb.com/title/tt0058331/quotes/qt0437047)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.