JavaScript Exercises: Verify at least one element satisfy a condition

JavaScript Stack: Exercise-34 with Solution

Write a JavaScript program that implements a stack and checks if at least one element of the stack satisfies 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;
  }
  some(callback) {
    return this.items.some(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 at least one element of the stack is odd?");
const result = stack1.some(element => element % 2 === 0);
console.log(result);
console.log("Check if at least one element of the stack is greater than 10:");
const result1 = stack1.some(element => element > 10);
console.log(result1);
console.log("Check if at least one element of the stack is odd?");
const result2 = stack1.some(element => element % 2 !== 0);
console.log(result2);
console.log("Check if at least one element of the stack is less than 3:");
const result3 = stack1.some(element => element < 3);
console.log(result3);

Sample Output:

Original Stack:
Stack elements are:
1 2 3 4 5 6 7 8
Check if at least one element of the stack is odd?
true
Check if at least one element of the stack is greater than 10:
false
Check if at least one element of the stack is odd?
true
Check if at least one element of the stack is less than 3:
true

Flowchart:

Live Demo:

See the Pen javascript-stack-exercise-34 by w3resource (@w3resource) on CodePen.

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