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JavaScript Interview Challenges

Treasure Porth's Pro-tier interview-prep course: about 2.3 hours of frontend JavaScript coding challenges built to rehearse the kind of problems interviewers actually ask.

Quick answer​

JavaScript Interview Challenges is a 2.3-hour, Pro-tier, intermediate course taught by Treasure Porth. It is a set of coding drills aimed squarely at frontend technical interviews, so you practice solving problems rather than learning new concepts. It is worth it if you already know JavaScript and have interviews coming up. It is not a teaching course, and it works best alongside React Interview Questions and Frontend Interview Tips.

Is it worth your time?​

If you have interviews lined up and want to rehearse under realistic conditions, this is a focused way to do it. The challenge format means you are solving problems in the player, which is far closer to a live coding interview than reading solutions, and 65 challenges is enough volume to build real fluency.

The honest caveat is that this is practice, not instruction. It assumes you already know the JavaScript it asks you to apply, and it will not teach you a concept you are missing. If you are still learning the language, drilling interview problems will be frustrating before it is useful.

What you'll learn​

This is a practice course, so the value is in the reps rather than a syllabus. You work through 65 coding challenges of the type that show up in frontend JavaScript interviews, building speed and pattern recognition for common problem shapes. The point is to make the familiar problems automatic so you can spend interview brainpower on the unfamiliar ones.

Treat it as a drill book. The more you have already learned about JavaScript, the more these challenges sharpen rather than teach.

Who it's for, and who should skip it​

It fits developers who already know JavaScript and are preparing for frontend coding interviews, or anyone who wants structured practice to keep their problem-solving sharp.

Skip it if you are still learning the language; do Learn JavaScript and ideally Advanced JavaScript first. Also skip it if your interviews are framework-specific, where React Interview Questions is the better target.

Prerequisites​

Solid working JavaScript: functions, array and object methods, scope, and basic algorithmic thinking. This course asks you to apply those, not learn them.

Where it fits​

JavaScript Interview Challenges is the interview-prep stop on the Frontend Developer Path and the Fullstack Developer Path, best taken near the end once your fundamentals are in place.

Free or Pro​

This is a Pro course, so it requires a Scrimba subscription. Pro also covers the full career paths, the coding challenges, the Discord, and certificates. See current plans for what Pro costs in your region.

Strengths and limits​

What it does well: realistic interview-style practice in the player, enough challenges to build genuine fluency, and a clear focus on the frontend interview context.

Where it is limited: it teaches nothing new, so your mileage depends entirely on what you already know, and it is JavaScript-general rather than tailored to any specific company or framework interview.

View JavaScript Interview Challenges on Scrimba (opens in a new tab)

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