JavaScript Exercises: Verify all stack elements satisfy a condition

JavaScript Stack: Exercise-33 with Solution

Check All Satisfy Condition

Write a JavaScript program that implements a stack and checks if all elements of the stack satisfy a condition.

Sample Solution:

JavaScript Code:

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

  // push element to the stack
  push(element) {
    this.items.push(element);
  }

  // pop element from the stack
  pop() {
    if (this.items.length == 0) {
      return "Underflow";
    }
    return this.items.pop();
  }

  // get the top element of the stack
  peek() {
    return this.items[this.items.length - 1];
  }

  // check if the stack is empty
  isEmpty() {
    return this.items.length == 0;
  }

  // get the size of the stack
  size() {
    return this.items.length;
  }
 fromArray(array) {
    this.items = array.slice(); // copy the array to the items array
  } 
every(callback) {
    return this.items.every(callback);
  }  
 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();
 }
}

const stack1 = new Stack();
stack1.push(1);
stack1.push(2);
stack1.push(3);
stack1.push(4);
stack1.push(5);
stack1.push(6);
stack1.push(7);
stack1.push(8);
console.log("Original Stack:");
console.log(stack1.displayStack(stack1));
console.log("Check if all elements are odd?");
const result = stack1.every(element => element % 2 !== 0);
console.log(result);
console.log("Check if all elements are less than 10:");
const result1 = stack1.every(element => element < 10);
console.log(result1);
const stack2 = new Stack();
stack2.push(2);
stack2.push(4);
stack2.push(6);
stack2.push(8);
stack2.push(10);
console.log("Original Stack:");
console.log(stack2.displayStack(stack2));
console.log("Check if all elements are even?");
const result2 = stack2.every(element => element % 2 === 0);
console.log(result2);

Sample Output:

Original Stack:
Stack elements are:
1 2 3 4 5 6 7 8
Check if all elements are odd?
false
Check if all elements are less than 10:
true
Original Stack:
Stack elements are:
2 4 6 8 10
Check if all elements are even?
true

Flowchart:

Live Demo:

See the Pen javascript-stack-exercise-33 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if all elements in a stack satisfy a provided predicate function.
• Write a JavaScript function that iterates over a stack using a loop to test whether every element meets a condition.
• Write a JavaScript function that employs the every() method on the stack converted to an array and returns a boolean.
• Write a JavaScript function that handles empty stacks by returning true if there are no elements to contradict the condition.

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