array-based stack and queue, without using built in push pop

foo.js

function stack () {
	var content = [];
	return {
		push: function (v) {
			content[content.length] = v;
		},
		pop: function () {
			var result = content.splice(-1, 1);
			if (result.length === 1) {
				return result[0];
			}
		}
	};
};

function queue () {
	var content = [];
	return {
		enqueue: function (v) {
			content[content.length] = v;
		},
		dequeue: function () {
			var result = content.splice(0, 1);
			if (result.length === 1) {
				return result[0];
			}
		}
	};
};

var s = stack();

console.log(s);

s.push(1);
s.push(2);
s.push(3);

console.log(s.pop());
console.log(s.pop());
console.log(s.pop());

var q = queue();

console.log(q);

q.enqueue(1);
q.enqueue(2);
q.enqueue(3);

console.log(q.dequeue());
console.log(q.dequeue());
console.log(q.dequeue());