realish deck shuffling

realish-deck-shuffling.markdown

realish deck shuffling

A Pen by Something Formed on CodePen.

License.

script.js

function print(x) {
	console.log(x)
}

var shuffle = {}

shuffle.cut = function(deck) {
	let pile = deck,
		deck_a = [],
		deck_b = [],
		cut = Math.floor((Math.random() * pile.length / 3) + (pile.length / 3)),
		index = 0

	for (let x = 0; x < cut; x++) {
		deck_a.push(pile[x])
		index = index + 1
	}
	for (let y = index; y < pile.length; y++) {
		deck_b.push(pile[y])
	}

	return [
		deck_a,
		deck_b
	]
}

shuffle.combine = function(cut) {
	let pile = []

	pile = cut[1].concat(cut[0])

	return pile
}

shuffle.riffle = function(cut) {
	let deck = cut,
		pile = [],
		size = deck[0].length + deck[1].length

	while (size > 0) {
		let roll = Math.floor(Math.random() * 1.99)
		card = deck[roll].pop()
		if (card !== undefined) {
			pile.push(card)
			size = size - 1
		}
	}

	return pile
}

// test deck
var tester = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

// cut the deck
print(shuffle.cut(tester))

// cut the deck and recombine
print(shuffle.combine(shuffle.cut(tester)))

// cut the deck and riffle combine
print(shuffle.riffle(shuffle.cut(tester)))