Javascript Data Structure Stack via class

class Stack {//  w  w  w. j a v a 2 s. c  o m

    constructor () {
        this.items = [];
    }

    push(element){
        this.items.push(element);
    }

    pop(){
        return this.items.pop();
    }

    peek(){
        return this.items[this.items.length-1];
    }

    isEmpty(){
        return this.items.length == 0;
    }

    size(){
        return this.items.length;
    }

    clear(){
        this.items = [];
    }

    print(){
        console.log(this.toString());
    }

    toString(){
        return this.items.toString();
    }
}
let stack = new Stack();
 console.log(stack.isEmpty()); //outputs true
 stack.push(5);
 stack.push(8);
 console.log(stack.peek()); // outputs 8
 stack.push(11);
 console.log(stack.size()); // outputs 3
 console.log(stack.isEmpty()); //outputs false
 stack.push(15);
 stack.pop();
 stack.pop();
 console.log(stack.size()); // outputs 2
 stack.print(); // outputs [5, 8]