JS queue structure WTF

gistfile1.js

function Queue() {
	this.dataStore = [];
}

Queue.prototype.enqueue = function (element) {
	this.dataStore.push(element);
};

Queue.prototype.dequeue = function () {
	return this.dataStore.shift();
};

Queue.prototype.toString = function () {
	return this.dataStore.join('\n');
};

// Deque extension of Queue

function Deque() {}
Deque.prototype = new Queue();

Deque.prototype.cut = function(element) {
	this.dataStore.unshift(element);
};

Deque.prototype.iKnowTheDj = function() {
	return this.dataStore.pop();
};

// Testing

shittyLine.enqueue('Dippy');
shittyLine.enqueue('Sprinkles');
shittyLine.enqueue('Happy');
console.log(shittyLine.toString());
shittyLine.dequeue();
console.log(shittyLine.toString());
shittyLine.cut('Bozo');
console.log(shittyLine.toString());
shittyLine.iKnowTheDj();
console.log(shittyLine.toString());

// Why?

var testing = new Deque();
console.log('WTF');
console.log(testing.toString());

// Output: 
// Bozo
// Sprinkles