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Stream.map.

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This commit is contained in:
Rob Rix 2015-09-16 12:27:23 -04:00
parent 0dfd3a5ecd
commit 9c47dae557
1 changed files with 5 additions and 0 deletions
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5
prototype/Doubt/Stream.swift
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@ -34,4 +34,9 @@ public enum Stream<A> {
public var isEmpty: Bool {
return uncons == nil
}
public func map<B>(transform: A -> B) -> Stream<B> {
return uncons.map { first, rest in Stream<B>.Cons(transform(first), { rest.map(transform) }) } ?? Stream<B>.Nil
}
}