Array Shuffle

gistfile1.coffee

arrayShuffle = (arr, numOfSwaps = arr.length / 2) ->
    #copy array
    newArr = arr.slice(0)
        
    for i in [0...numOfSwaps]
        rnd1 = Math.floor( Math.random() * arr.length )
        rnd2 = Math.floor( Math.random() * arr.length )
        
        #swap elements
        buf = newArr[rnd1]
        newArr[rnd1] = newArr[rnd2]
        newArr[rnd2] = buf
        

    return newArr