Remove Duplicates from an Array — JS Technical Interview Questions & Answers

Using Set and filter-based approaches.

Remove Duplicates from an Array

  • Remove Duplicates from an Array (js program dedupe) 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 Remove Duplicates from an Array (js program dedupe).
  • From the example next to this theory: Using Set and filter-based approaches.
  • Trap: mutating while filtering. Fix that before you talk about advanced JS.
  • Viva: what is Remove Duplicates from an Array (js program dedupe)? Then show filter(m => m < 40). Then name the trap.

Technical Interview Tip: What is Remove Duplicates from an Array (js program dedupe)? Show this: filter(m => m < 40). Trap: mutating while filtering.

Code Examples for Remove Duplicates from an Array

Remove Duplicates from an Array — working example

const nums = [1, 2, 3, 4, 5];
const evens = nums.filter((n) => n % 2 === 0);
const doubled = evens.map((n) => n * 2);
const sum = doubled.reduce((a, b) => a + b, 0);
console.log(evens, doubled, sum);
console.log(nums.includes(3), nums.find((n) => n > 3));

Remove Duplicates from an Array — common array methods return new values (filter/map/reduce) or search without mutating.

How to Explain Remove Duplicates from an Array to an Interviewer

What is Remove Duplicates from an Array (js program dedupe)?

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

Give one small example of Remove Duplicates from an Array (js program dedupe).

filter(m => m < 40) Using Set and filter-based approaches

What mistake do beginners make with Remove Duplicates from an Array (js program dedupe)?

mutating while filtering Show the fix

Where do you use Remove Duplicates from an Array (js program dedupe)?

a marks list fail students only