Own map, filter, and reduce before React humbles you
Quick answer: Scrimba’s Learn JavaScript, ES6+, and interview challenge courses turn array methods into hundreds of micro-reps—typed in the player, not copied from a gist. That is the substrate every hooks-heavy UI sits on.
Last reviewed: March 2026.
Array methods are the bread and butter of React—this page points at the fastest interactive stacks on Scrimba.
Who this is for
Anyone who “kind of gets” map until an interviewer asks for reduce with a straight face.
Why Practice JavaScript Arrays on Scrimba?
Reading documentation is passive. To truly master JavaScript Arrays, you need to write code. Scrimba's interactive format lets you:
- Pause the video at any moment
- Edit the code directly in the player
- Run it to see your changes instantly
Top Courses to Practice JavaScript Arrays
Free JavaScript Tutorial: Learn the basics in this 9-hour interactive course lead by Per Borgen
Level: Beginner | Duration: 9.4 hrs
Learn the basics of JavaScript by solving 140+ interactive coding challenges. Along the way you will build a game, a browser extension, and even
JavaScript Interview Challenge Tutorial: Learn, practice and prepare with this course
Level: Intermediate | Duration: 2.3 hrs
Your essential tech interview preparation pack! Practice solving problems and honing the skills you need to succeed in a frontend coding intervie
Introduction to ES6+ Tutorial: Learn modern JavaScript features in this free course
Level: Intermediate | Duration: 119 min
This ES6 tutorial teaches you modern JavaScript through 23 screencasts. You'll get a systematic walk-through of the most important ES6+ features
How to Practice Effectively
- Don't just watch. Whenever the instructor writes code, pause and type it yourself.
- Break things. Change values, delete lines, and see what happens.
- Do the challenges. Scrimba courses have built-in challenges. Do not skip them.
Use this guide when…
You can follow a React tutorial but data transformations still feel fuzzy—fix the JS layer first, inside scrims.
Drill arrays inside scrims
Huge chunks of Learn JavaScript are free; Pro unlocks deeper interview + path content.