How to FLATTEN an array in JavaScript? (4 ways in under 14 mins!)
Timestamps:
0:04 - What does Flattening mean?
0:40 - flat()
02:37 - loop + recursion
06:33 - Recap of solution
07:27 - reduce + recursion
10:09 - Recap of solution
11:02 - No Recursion
13:15 - Outro
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Ever wondered how to flatten a nested array in JavaScript?
This is one of the most common JavaScript interview questions, and in this video, I break it down step by step using 4 different approaches, from beginner-friendly to interview-level solutions.
You’ll already know what this video is about from the title — so yeah, let’s get started 😄
🔍 What you’ll learn in this video:
What flattening an array actually means
How to flatten deeply nested arrays
4 different ways to solve the same problem
Which approach to use in real projects vs interviews
Pros & cons of each solution
This video is perfect if you’re:
Preparing for JavaScript interviews
Learning DSA in JavaScript
Wanting to write cleaner, more optimized JS code
Flattening an array is one of the most asked JavaScript interview questions, and if you only know one solution, you’re already limiting yourself.
In this video, you’ll learn how to flatten a nested array in JavaScript using 4 different approaches, explained line by line — from beginner-friendly solutions to interview-ready and senior-level techniques.
You’ll already know what this video is about from the title — so yeah, let’s get started.
🔍 What you’ll learn in this JavaScript tutorial:
What flattening an array means in JavaScript
How to flatten deeply nested arrays
Flatten arrays using built-in methods
Flatten arrays using recursion
Flatten arrays using reduce()
Flatten arrays without recursion
Which solution is best for JavaScript interviews
This video is ideal if you are:
Preparing for JavaScript interviews
Learning Data Structures and Algorithms in JavaScript
A frontend developer or full-stack developer
Looking to improve problem-solving skills in JavaScript
Convert this nested array:
[1, [2, [3, 4]], 5]
Into a single-level array:
[1, 2, 3, 4, 5]
No matter how deep the nesting is.
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