TypeScript Recipes: Code & SQL
Runnable TS cheat sheet
Free · In-App Purchases
AI-written TypeScript looks fine until the compiler sees it. Here, every run is a strict type check plus the real output, right in the app.
Tap Run and the real output appears right under the code, along with any type errors. You know what the code does before it goes into your project. No Node.js or TypeScript to install, no IDE, no account.
360+ short examples, one task each. Over 90% run on Node.js 24 and pass strict TypeScript 7 type checking.
You know what you need, but not the exact syntax:
• How do I remove duplicates from an array?
• How do I get an enum value from its name?
• How do I merge two Maps?
Each has a working example here.
• 22 sections, including strings and dates, arrays and collections, classes and interfaces, enums, generics, arrow functions, async/await, exception handling, regular expressions, files, JSON, algorithms, and design patterns.
• What changed from TypeScript 3.0 to 5.5, with before-and-after code: the unknown type, the ?. and ?? operators, template literal types, the satisfies operator, using declarations.
• Reference, 120+ entries: keywords, operators, and utility types such as Partial, Pick, Record, and ReturnType. Tap a word in the code to look it up.
• 200+ SQL queries: JOIN, GROUP BY, subqueries, window functions; more than half run on a practice database.
• Search looks inside the code: type reduce to find every example that uses it.
• Edit an example and run your version, or write your own: a type error shows up right away.
• Works on iPhone, iPad, and Mac.
• Everything except running code works offline.
Free version: 190+ TypeScript examples and 120+ SQL queries, the full reference, and 12 runs and 12 edits a day (TypeScript and SQL runs share one limit). Full version: all examples and queries, unlimited edits and examples of your own, and up to 30 TypeScript and 80 SQL runs a day. One-time purchase, no subscription.
Built by a developer for developers. The project behind it has been in active development since 2015.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• Run code right in the app: tap Run and the real Node.js 24 output appears under the example, along with any TypeScript 7 type errors. You can also edit an example and run your version.
• TypeScript reference for keywords, operators, and utility types, with 120+ entries. Tap a word in the code to look it up.
• New section: what changed from TypeScript 3.0 to 5.5, with before-and-after code.
• Improved support for foldable phones and large screens.
The developer, Fedor Obraztsov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Fedor Obraztsov
- Size
- 7.1 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 13.0 or later.
- iPhone
- Languages
English and 14 more
- English, Arabic, French, German, Hebrew, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Turkish, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SQL queries 0,99 €
- TypeScript Samples 0,99 €
- Оperations with example 0,99 €
- Full version 2,99 €
- Copyright
- © Obraztsov Fedor Alexandrovich