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Add leftwise flatMap operator for Decoded

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This version of the operator was left out for some reason. This wasn't
intentional, so we're just correcting the oversight.
This commit is contained in:
Gordon Fontenot
2016-01-15 15:45:49 -07:00
parent dce33c1197
commit b4ed0850ab
1 changed files with 15 additions and 0 deletions
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15
Argo/Types/Decoded/Monad.swift
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@@ -13,6 +13,21 @@ public func >>- <T, U>(x: Decoded<T>, @noescape f: T -> Decoded<U>) -> Decoded<U
return x.flatMap(f)
}
/**
flatMap a function over a `Decoded` value (left associative)
- If the value is a failing case (`.TypeMismatch`, `.MissingKey`), the function will not be evaluated and this will return the value
- If the value is `.Success`, the function will be applied to the unwrapped value
- parameter x: A value of type `Decoded<T>`
- parameter f: A transformation function from type `T` to type `Decoded<U>`
- returns: A value of type `Decoded<U>`
*/
public func -<< <T, U>(@noescape f: T -> Decoded<U>, x: Decoded<T>) -> Decoded<U> {
return x.flatMap(f)
}
public extension Decoded {
func flatMap<U>(@noescape f: T -> Decoded<U>) -> Decoded<U> {
switch self {