JavaScript Exercises: Check if an element is present or not in a stack
JavaScript Stack: Exercise-8 with Solution
Write a JavaScript program to implement a stack that checks if a given element is present or not in the 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;
}
// Check whether a given element is present in the stack or not
contains(element) {
return this.items.includes(element);
}
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("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));
let n = 10;
console.log("Check if "+n+ " is present in the said stack?");
console.log(stack.contains(n));
n = 5;
console.log("Check if "+n+ " is present in the said stack?");
console.log(stack.contains(n));
Sample Output:
Initialize a stack: Input some elements on the stack: Stack elements are: 1 4 3 2 5 6 Check if 10 is present in the said stack? false Check if 5 is present in the said stack? true
Flowchart:


Live Demo:
See the Pen javascript-stack-exercise-6 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Stack Previous: Count all the elements in a given stack.
Stack Exercises Next: Remove duplicates from a given stack.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join