JavaScript Exercises: Remove all the elements from a given stack

JavaScript Stack: Exercise-6 with Solution

Clear Stack

Write a JavaScript program to remove all elements from a given stack.

Sample Solution:

JavaScript Code:

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

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

  pop() {
    if (this.isEmpty())
      return "Underflow";
    return this.items.pop();
  }

  peek() {
    if (this.isEmpty())
      return "No elements in Stack";
    return this.items[this.items.length - 1];
  }

  isEmpty() {
    return this.items.length === 0;
  }
  clear() {
    this.items = [];
  }
 // Returns the number of elements in the stack
 size() {
    return this.items.length;
  }  

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();
 }        
}
console.log("Initialize a stack:")
let stack = new Stack();
console.log("Is the stack empty?");
console.log(stack.isEmpty()); 
console.log("Input some elements on the stack:")
stack.push(1);
stack.push(4);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(6); 
console.log(stack.displayStack(stack));
console.log("Remove all the elements from the said stack:")
stack.clear();
console.log("Is the stack empty?");
console.log(stack.isEmpty());

Sample Output:

Initialize a stack:
Is the stack empty?
true
Input some elements on the stack:
Stack elements are:
1 4 3 2 5 6
Remove all the elements from the said stack:
Is the stack empty?
true

Flowchart:

Live Demo:

See the Pen javascript-stack-exercise-5 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that empties a stack by setting its length property to zero and returns the cleared stack.
• Write a JavaScript function that pops all elements from a stack one by one and logs each popped value.
• Write a JavaScript function that clears a stack implemented as a linked list by severing its head pointer.
• Write a JavaScript function that empties a stack and verifies the operation by checking if isEmpty() returns true.

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