# Enigma JS: Interview questions — JavaScript and React Native

> JavaScript and React Native interview question quiz app with explanations. (iPhone/iPad app by Yesno Labs.)

- Source: https://appshunter.io/ios/app/enigma-js-interview-questions/id1308401829 (this page in markdown: same URL + `.md`)
- Developer: [Yesno Labs](https://appshunter.io/developer/1704491583)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 59 MB
- Languages: American English
- Released: 2017-11-11
- Data updated: 2026-06-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/enigma-js-interview-questions/id1308401829/reviews.md

## What is Enigma JS?

Enigma is a JavaScript quiz app featuring the most common interview questions. Here, you’ll find tricky parts of JavaScript language and the key concepts essential for React and React Native developers.

Whether you are an experienced developer or a beginner, you'll find questions and explanations in this app that will help you learn and practice. Some quizzes are designed to understand the basics, while others targeting tricky parts of the Javascript language that we developers encounter time to time.

- Refresh your knowledge by having quick quizzes anywhere during your day.
- Stay up-to-date by learning and practicing tricky parts of the language.
- For each question see detailed explanations that are designed to help you comprehend the concepts.

## Key features

- Common JavaScript interview questions
- React and React Native concepts
- Detailed explanations for each question
- Quizzes for beginners and experienced developers
- Practice tricky language parts

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove ads and unlock content | $9.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/enigma-js-interview-questions/id1308401829/reviews.md

### 3/5 — Some incorrect answers

*2024-01-11*

I like this app - great for learning or a fresher.  I have found some answers are incorrect

### 2/5 — Good idea - needs some work.

*2021-01-17*

I was looking for an app to keep my programming skills up and test my knowledge throughout the day. I downloaded Enigma and was not impressed. For one, the application is not optimized for newer devices. It doesn’t fit the screen of my iPhone XR. In terms of the actual quizzes, they need a lot of work done. Not enough context is given, so basic questions can easily be wrong. Leaving out info like what method (const, let, var...) a variable is defined can severely impact the result of an expression, and i’ve gotten several answers wrong because of this. We need an app like this so I kindly request some work to be done. Thank-you.

### 3/5 — Good, not great

*2018-12-14*

The content itself in this app is good. I have enjoyed taking the quizzes, and they have helped me. However, like another user wrote, there is ver little content and the ads drive me crazy.

### 1/5 — hata

*2018-10-28, version 1.0*

Uygulama ilk soruda kapanıyor

### 1/5 — Ad bananas

*2018-03-31*

Way too many ads, way too little content. Great concept. But very frustrating.

### 5/5 — Cool app for learning javascript

*2017-12-01, version 1.0*

App includes very usefull interview questions. Good way of learning javascript and react. Pretty professional design and userfriendly user interface.

### 5/5 — Very helpful!

*2017-11-30*

Find it very helpful, beginner developer here! Find lots of answers i needed! Thanks to the developer/s! Very impressed!

## Frequently asked questions about Enigma JS

### What is Enigma JS?

Enigma JS is a free mobile application designed to help developers practice and prepare for JavaScript, React, and React Native interviews. It features common interview questions with detailed explanations to reinforce learning.

### What kind of questions does Enigma JS cover?

Enigma JS covers tricky parts of the JavaScript language, essential concepts for React developers, and key elements for React Native developers. The quizzes are designed for both beginners and experienced programmers.

### Does Enigma JS offer offline access?

The description suggests users can refresh their knowledge by having quick quizzes anywhere during their day, implying offline accessibility for practice sessions.

### How does Enigma JS help users learn?

For each question, Enigma JS provides detailed explanations designed to help users comprehend the concepts. This feature aids in both learning new material and reinforcing existing knowledge.

### What is the update frequency for Enigma JS?

The app was last updated on June 10, 2025, indicating active development and maintenance. Users can expect ongoing improvements and content additions.

### Is Enigma JS suitable for beginners?

Yes, Enigma JS includes quizzes designed to help beginners understand the basics of JavaScript, React, and React Native, alongside more advanced questions for experienced developers.

### Does Enigma JS have ads?

Yes, the application contains advertisements. It also offers in-app purchases, suggesting a model where ads may be removed or additional content unlocked.

### What platforms is Enigma JS available on?

Enigma JS is available for iPhone, iPad, and iPod devices, as indicated by its supported devices list.

## Version history (last 5 releases)

### 3.0.2 — 2025-06-10

- Content improvements

### 3.0.1 — 2025-03-25

Bug fixes

### 3.0.0 — 2025-03-04

- Added much more interview questions and quizzes for JS, React and React Native developers
- Completely redesigned

### 2.1 — 2024-01-07

Maintenance update

### 2.0 — 2022-03-04

- Bug fixes and UI improvements

## Apps similar to Enigma JS

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| --- | --- | --- | --- |
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| [JavaScript Console Editor](https://appshunter.io/ios/app/javascript-console-editor/id6450764260) | 3.0 (1) | Free | Education |
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| [Javascript Learn & Code editor](https://appshunter.io/ios/app/javascript-learn-and-code-editor/id1384831053) | 4.3 (7) | Free | Education |
| [JavaScript Champ](https://appshunter.io/ios/app/javascript-champ/id6473677887) | 5.0 (2) | Free | Education |

## More apps by Yesno Labs

- [Mental Math Practice & Riddles](https://appshunter.io/ios/app/mental-math-practice-and-riddles/id6463495405)

All apps by Yesno Labs: https://appshunter.io/developer/1704491583

## Related topics

[javascript questions](https://appshunter.io/ios/topics/javascript-questions)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*