LeetCode: linked-list-based stack, more performant than default JS's array-based one

simple-js-stack.js

function createStack() {
    let top = { next: undefined, value: undefined };
    function isEmpty() { return top.next === undefined; }
    function push(v) { top = { next: top, value: v }; }
    function pop() {
        if (isEmpty()) return undefined;
        const { value } = top;
        top = top.next;
        return value;
    }
    function peek() { return top.value; }
    function clear() { return createStack(); }
    return { isEmpty, push, pop, peek, clear };
};