Set Basics — JS Technical Interview Questions & Answers

A collection of unique values.

Set Basics

  • Set Basics (js intro) is a JS topic. In plain words you use it for let total = 0 in a cart script. Don’t start with a slogan — start with that picture.
  • Smallest example: let for change, const for fixed. Type it, run it, and say what you see. If you can do that from memory, you know Set Basics (js intro).
  • From the example next to this theory: A collection of unique values.
  • Trap: var leak / const reassign. Fix that before you talk about advanced JS.
  • Viva: what is Set Basics (js intro)? Then show let for change, const for fixed. Then name the trap.

Technical Interview Tip: What is Set Basics (js intro)? Show this: let for change, const for fixed. Trap: var leak / const reassign.

Code Examples for Set Basics

Set Basics — working example

const tags = new Set(["js", "js", "sql"]);
tags.add("css");
console.log(tags.has("js"), tags.size);
console.log([...tags]);

Set Basics — set stores unique values — great for dedupe and membership checks.

How to Explain Set Basics to an Interviewer

What is Set Basics (js intro)?

Used for let total = 0 a cart script Not just the heading

Give one small example of Set Basics (js intro).

let for change, const for fixed A collection of unique values

What mistake do beginners make with Set Basics (js intro)?

var leak / const reassign Show the fix

Where do you use Set Basics (js intro)?

a cart script let total = 0