Critical-Thinking-in-JavaScript/stack.js at main · rashedulraha/Critical-Thinking-in-JavaScript · GitHub

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//? LIFO in last in first out

class Stack {
  constructor() {
    this.item = [];
  }

  push(value) {
    this.item.push(value);
  }
  pop() {
    if (this.isEmpty()) {
      return undefined;
    }

    this.item.pop();
  }
  peek() {
    if (this.isEmpty) {
      return undefined;
    }
    return this.item[this.item.length - 1];
  }

  isEmpty() {
    this.item.length === 0;
  }

  print() {
    console.log(this.item.slice().reverse().join(" -> "));
  }
}

const stack = new Stack();

// stack.push();
console.log(stack.peek());
console.log(stack.isEmpty());

stack.push(29);
stack.push(80);
stack.push(90);

stack.print();

console.log(stack.peek());
console.log(stack.pop());