JavaScript Exercises: Create a copy of the stack

JavaScript Stack: Exercise-25 with Solution

Copy Stack

Write a JavaScript program to implement a stack that creates a copy of the stack.

Sample Solution:

JavaScript Code:

class Stack {
  constructor() {
    this.items = [];
  }
  push(element) {
    this.items.push(element);
  }
  pop() {
    if (this.items.length == 0) {
      return "Underflow";
    }
    return this.items.pop();
  }

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

  isEmpty() {
    return this.items.length == 0;
  }
displayStack(stack) {
  console.log("Stack elements are:");
  let str = "";
  for (let i = 0; i < stack.items.length; i++)
    str += stack.items[i] + " ";
  return str.trim();
 }  
  copy() {
    var copiedStack = new Stack();
    copiedStack.items = [...this.items];
    return copiedStack;
  }
}
var stack1 = new Stack();
stack1.push(10);
stack1.push(20);
stack1.push(30);
stack1.push(40);
stack1.push(50);
console.log(stack1.displayStack(stack1));  
var stack2 = stack1.copy();
console.log("Create a copy of the said stack:")
console.log(stack2.displayStack(stack2));  

Sample Output:

Stack elements are:
10 20 30 40 50
Create a copy of the said stack:
Stack elements are:
10 20 30 40 50

Flowchart:

Live Demo:

See the Pen javascript-stack-exercise-25 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that creates a deep copy of a stack implemented as an array without modifying the original.
• Write a JavaScript function that clones a linked list based stack recursively and returns the new stack.
• Write a JavaScript function that duplicates a stack by converting it to an array and then recreating the stack from the array.
• Write a JavaScript function that validates the copied stack by comparing the top elements of both the original and copy.

Improve this sample solution and post your code through Disqus

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