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djleonskennedy/identity-functor-compare.hs

Created August 19, 2017 19:41
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Compare Identity Functor Implementation
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identity-functor-compare.hs
// Typescript
class Identity {
constructor(private x: any) {
}
map(f: Function): any {
this.x = f(this.x);
}
}
const id = new Identity(2);
id.map(x => x * 2)
// Haskell
data Identity a = Identity a;
map :: (a -> b) -> (Identity a) -> (Identity b)
map f (Identity a) = Identity (f a)
map (*2) $ Identity 2
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