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function createStack() {
    const stack = [];
    return {
        push(item) {
            stack.push(item);
        },
        pop() {
            return stack.pop();
        },
        peek() {
            return stack[stack.length - 1];
        },
        get length() {
            return stack.length;
        },
        isEmpty() {
            return stack.length === 0;
        }
    }
}
const s = createStack();
s.push(1);
s.push(2);
s.push(3);
console.log(s.length)
console.log(s.peek());
console.log(s.pop());
console.log(s.length)
console.log(s.pop())

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