Playing swift

Playing swift

// Playground - noun: a place where people can play

operator infix |> {
    associativity left
}

operator infix <| {
    associativity right
}

func |> <L, R>(left: L, right: L -> R) -> R {
    return right(left)
}

func <| <L, R>(left: R -> L, right: R) -> L {
    return left(right)
}

func unique<T:Hashable>(array: Array<T>) -> Array<T> {
    var filter = Dictionary<T, Bool>()
    var result = Array<T>()
    
    for i in 0..array.count {
        if let elem = filter[array[i]] {
            continue
        } else {
            filter[array[i]] = true
            result.append(array[i])
        }
    }
    return result
}

[7,2,3,4,5] |> sort |> unique |> toString

toString <| sort <| [7,2,4,4,5]

## http://www.mseri.me/piping-with-swift/ 
## http://www.kevinberridge.com/2012/12/neat-f-pipe-forward.html