32 lines
910 B
Pony
32 lines
910 B
Pony
actor Main
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new create(env: Env) =>
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env.out.print("hlo wld")
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// A tuple type is a sequence of types
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var x: (String, U64)
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x = ("hi", 3)
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x = ("bye", 7)
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// Pony supports tuple unpacking but calls it "destructuring"
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// This assigns "bye" to y and 7 to z
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(var y, var z) = x
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// You can access the elements of tuples directly using this
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// one weird syntax
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y = x._1
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z = x._2
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// You can't assign elements of tuples. To change the value
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// of a tuple you must reassign the whole thing.
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x = ("wibble wobble", x._2)
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// A union is a set of possible types
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// This means "a is a String or None":
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var a: (String | None)
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a = "yeah yeah whatever static analysis tool"
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// An intersection is a value that is more than one type at once
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// An example from the standard library:
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// type Map[K: (Hashable box & Comparable[K] box), V] is HashMap[K, V, HashEq[K]]
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// K is Hashable *and* Comparable[K] at the same time
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