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TypeScript from scratch

Four write-the-whole-thing exercises, from a typed counter to an event emitter

4 challenges

Start here

  1. 1. Challenge: Build a Type-Safe Counter

    beginner

    Implement a counter class with proper TypeScript types from scratch.

    TypeScript

  2. 2. Challenge: Generic Array Utilities

    intermediate

    Implement type-safe generic array utility functions from scratch.

    TypeScript

  3. 3. Challenge: Build a Promise Retry Utility

    advanced

    Implement a utility that retries failed Promise operations with exponential backoff.

    TypeScript

  4. 4. Challenge: Build a Type-Safe Event Emitter

    advanced

    Create a strongly-typed event emitter with proper TypeScript generics.

    TypeScript