ECMAScript 6 Array shuffle

ecmascript_6_array_shuffle.js

// METHOD 1
Object.assign(Array.prototype, {
    shuffle() {
		let m = this.length, i;
		while (m) {
        	i = (Math.random() * m--) >>> 0;
           	[this[m], this[i]] = [this[i], this[m]];
		}
        return this;
	}
});

ecmascript_6_array_shuffle_2.js

// METHOD 2
Object.assign(Array.prototype, {
    shuffle() {
		return this.sort(() => 0.5 - Math.random());
    }
});