JavaScript Interview Question: forEach vs map vs filter

Publicado el: 08 junio 2026
en el canal de: AQ FastLearn

If you're preparing for a frontend developer interview, understanding array methods is essential.

In this video, we compare three of the most commonly used JavaScript array methods:

👉 forEach
👉 map
👉 filter

You'll learn:

When to use forEach
When to use map
When to use filter
What each method returns
Data transformation in JavaScript
Common frontend interview concepts

We use simple examples to explain how each method works and when to use it in real-world projects.

📌 Perfect for:

Frontend developers
JavaScript beginners
React developers
Technical interview preparation

Interview Answer:
"The main difference is what they return. forEach iterates through an array and returns undefined. map creates a new array by transforming every element. filter creates a new array containing only elements that match a condition."

0:34 Understanding forEach
1:06 Understanding map
1:33 Understanding filter
2:05 Quick summary
2:19 Interview-ready answer

#javascript #frontenddevelopment #webdevelopment #codinginterview #reactjs

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