# Pairlet — Practice JavaScript & TypeScript Interview Problems

> Pairlet (https://www.pairlet.dev) is a browser-first practice and interview tool for JavaScript and TypeScript. Problems can be solved solo in the browser, or run as a live collaborative room with a candidate.

## Key Features
- **Solo practice (72 problems with test cases)**: Solve a problem on your own, run it against a fixed set of test cases including edge cases, and see per-case pass or fail. No account and no second person required.
- **Code review drills (10 problems)**: Read realistic code with planted flaws, write down what you would flag, then compare with what an interviewer is looking for.
- **Shareable interview rooms**: Create a room, choose a task, and invite a candidate with one URL. Candidate accounts are not required.
- **Real-time collaboration**: Monaco editor with Yjs-backed cursors, presence, and shared code.
- **Browser execution**: JavaScript runs in a Web Worker. TypeScript uses a lightweight syntax stripper and supports a limited subset rather than full compiler-backed type checking.
- **Problem library (82 tasks)**: Coding challenges and code-review exercises with JavaScript and TypeScript starter code.
- **Custom tasks**: Interviewers can provide a title, description, examples, and starter code.
- **Local templates**: Interview setup templates can be saved in browser storage.

## Core Navigation
- [Homepage and features](https://www.pairlet.dev)
- [Run a live interview](https://www.pairlet.dev/interview/new)
- [Pairlet for companies and interviewers](https://www.pairlet.dev/for-companies)
- [Problem library](https://www.pairlet.dev/problems)
- [Code review interview exercises](https://www.pairlet.dev/problems/code-review)
- [Code review interview guides](https://www.pairlet.dev/blog/code-review)
- [Backend code review interview](https://www.pairlet.dev/blog/code-review/backend-code-review-interview)
- [Code review vs algorithm interview](https://www.pairlet.dev/blog/code-review/code-review-vs-algorithm-interview)
- [Blog and interview guides](https://www.pairlet.dev/blog)

## Curated Technical Guides
- [JavaScript interview questions](https://www.pairlet.dev/blog/javascript/javascript-interview-questions)
- [JavaScript coding interview preparation](https://www.pairlet.dev/blog/javascript/javascript-coding-interview)
- [JavaScript async interview questions](https://www.pairlet.dev/blog/javascript/javascript-async-interview-questions)
- [JavaScript closures explained](https://www.pairlet.dev/blog/javascript/javascript-closures-interview)

## Contact
- Email: hello@pairlet.dev