Method push

javascript/0155-min-stack.js:24–31

* @param {number} val * @return {void}

(val, { minStack } = this)

     * @return {void}
     */
    push(val, { minStack } = this) {
        this.stack.push(val); /* Space O(N) */

        const isMinEmpty = !minStack.length;
        const hasNewMin = val <= this.top(minStack);
        const canAddMin = isMinEmpty || hasNewMin;
        if (canAddMin) minStack.push(val); /* Space O(N) */
    }

    /**
     * @return {void}