push() and pop() — JS Technical Interview Questions & Answers

Adding/removing elements at the end of an array.

push() and pop()

  • push() and pop() (array) is a JS topic. In plain words you use it for fail students only in a marks list. Don’t start with a slogan — start with that picture.
  • Smallest example: filter(m => m < 40). Type it, run it, and say what you see. If you can do that from memory, you know push() and pop() (array).
  • From the example next to this theory: Adding/removing elements at the end of an array.
  • Trap: mutating while filtering. Fix that before you talk about advanced JS.
  • Viva: what is push() and pop() (array)? Then show filter(m => m < 40). Then name the trap.

Technical Interview Tip: What is push() and pop() (array)? Show this: filter(m => m < 40). Trap: mutating while filtering.

Code Examples for push() and pop()

push() and pop() — working example

// Topic: push() and pop()
const nums = [1, 2, 3];
const doubled = nums.map((n) => n * 2);
console.log(doubled);
console.log(doubled.reduce((a, b) => a + b, 0));

push() and pop(): map then reduce on [1, 2, 3]. Say both prints.

How to Explain push() and pop() to an Interviewer

What is push() and pop() (array)?

Used for fail students only a marks list Not just the heading

Give one small example of push() and pop() (array).

filter(m => m < 40) Adding/removing elements at the end of an array

What mistake do beginners make with push() and pop() (array)?

mutating while filtering Show the fix

Where do you use push() and pop() (array)?

a marks list fail students only