JavaScript Exercises: Nth element from the bottom of the stack
JavaScript Stack: Exercise-17 with Solution
Write a JavaScript program to get the nth element from the bottom of 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() {
return this.items[this.items.length - 1];
}
isEmpty() {
return this.items.length === 0;
}
size() {
return this.items.length;
}
getNthFromBottom(n) {
if (n < 1 || n > this.items.length)
return "Invalid index";
return this.items[n - 1];
}
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();
}
}
let stack = new Stack();
stack.push(100);
stack.push(200);
stack.push(300);
stack.push(400);
stack.push(500);
stack.push(600);
stack.push(700);
console.log(stack.displayStack(stack));
n = 2;
console.log("nth element from the bottom of the stack where n = "+n);
console.log(stack.getNthFromBottom(n));
n = 5;
console.log("nth element from the bottom of the stack where n = "+n);
console.log(stack.getNthFromBottom(n));
n = 7;
console.log("nth element from the bottom of the stack where n = "+n);
console.log(stack.getNthFromBottom(n));
Sample Output:
Stack elements are: 100 200 300 400 500 600 700 nth element from the bottom of the stack where n = 2 200 nth element from the bottom of the stack where n = 5 500 nth element from the bottom of the stack where n = 7 700
Flowchart:



Live Demo:
See the Pen javascript-stack-exercise-17 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Stack Previous: Nth element from the top of the stack.
Stack Exercises Next: Move the nth element from the top of the stack to the top.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
JavaScript: Tips of the Day
Creates an array of elements, ungrouping the elements in an array produced by zip and applying the provided function
Example:
const tips_unzip = (arr, fn) => arr .reduce( (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc), Array.from({ length: Math.max(...arr.map(x => x.length)) }).map(x => []) ) .map(val => fn(...val)); console.log(tips_unzip([[2, 15, 200], [3, 25, 300]], (...args) => args.reduce((acc, v) => acc + v, 0)));
Output:
[5, 40, 500]
- Weekly Trends
- 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
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises