alskipp

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alskipp

/*
Pipe forward operator:
Applies the function on the right to the value on the left
*/
infix operator |> {associativity left precedence 95}
func |> <A,B>(x:A, f:A -> B) -> B {
    return f(x)
}

/*

alskipp

func pure<A>(x:A) -> [A] {
    return [x]
}

func filterM<A>(xs:[A], predicate: A -> [Bool]) -> [[A]] {
    return reduce(xs, pure([])) { acc, x in
        predicate(x).flatMap { b in b ? (acc.flatMap { pure($0 + [x]) }) : acc }
    }
}

alskipp

-- data structure for RGBA, RGB & CMYK colors
data Color = RGBA Float Float Float Float
           | RGB  Float Float Float
           | CMYK Float Float Float Float
           deriving (Eq, Ord, Show)

-- list of colors
colors = [ RGBA 0.1 0.1 0.5 0.2
         , RGBA 1 1 0 0.9
         , RGB 0.5 0.5 0

alskipp

import Data.Char
import Data.Maybe

letters :: [(Char, String)]
letters =  [
    ('A', "Alpha"),  ('B', "Bravo"),   ('C', "Charlie"),
    ('D', "Delta"),  ('E', "Echo"),    ('F', "Foxtrot"),
    ('G', "Golf"),   ('H', "Hotel"),   ('I', "India"),
    ('J', "Juliett"),('K', "Kilo"),    ('L', "Lima"),
    ('M', "Mike"),   ('N', "November"),('O', "Oscar"),

alskipp

/*
This is a demonstration of how to implement the Optional type in Swift.
The name 'Maybe' is taken from Haskell, but the two cases 'None' & 'Some'
are the same as Swift's Optional type (Haskell uses 'Nothing' & 'Just').

The Maybe type conforms to NilLiteralConvertible, as does Swift's
Optional type. This allows a Maybe value to be constructed from 'nil'.

One aspect of Swift's Optional type which can't be reproduced is
'implicit Optional wrapping'. Here's an example:

alskipp

type MilliLitresWaterPerGram = Double
type CaloriesPerGram = Double
type Grams = Double
  
data Food = Dry CaloriesPerGram
          | Wet CaloriesPerGram MilliLitresWaterPerGram
          deriving (Show, Eq)

data Animal = Cat { clawLength :: Double, calorieCount :: Double, hydrationLevel :: Double }
            | Dog { barkVolume :: Double, calorieCount :: Double, hydrationLevel :: Double }

alskipp

type Peg = String
type Move = (Peg, Peg)

hanoi :: Integer -> Peg -> Peg -> Peg -> [Move]
hanoi 0 _ _ _ = []
hanoi n a b c = hanoi (n-1) a c b ++ [(a,b)] ++ hanoi (n-1) c b a

{-
Usage:
hanoi 3 "a" "b" "c"

alskipp

// Swift 2.0

/* Function composition operator */
infix operator •> { associativity left precedence 150 }
func •> <A,B,C> (f:A -> B, g:B -> C ) -> A -> C {
  return { g(f($0)) }
}

extension Array where T: IntegerType {
  func sum() -> T {

alskipp

import Foundation

extension Character {
    func utf8() -> UInt8 {
        let utf8 = String(self).utf8
        return utf8[utf8.startIndex]
    }
}
 
func encrypt(c:Character, key:Character) -> String {