Mastering TypeScript Generics

Generics are one of the most powerful features in TypeScript. They allow you to write reusable, type-safe code.

What Are Generics?

Generics allow you to create components that work with any data type while still maintaining type safety.

function identity(arg: T): T {
  return arg;
}
const result = identity("hello");

Generic Constraints

Sometimes you want to limit the types that can be used with generics:

interface HasLength {
  length: number;
}
function logLength(arg: T): number {
  console.log(arg.length);
  return arg.length;
}

Generic Classes

Generics work great with classes too:

class Container {
  private value: T;
  constructor(value: T) {
    this.value = value;
  }
  getValue(): T {
    return this.value;
  }
}

Conclusion

Understanding generics will make you a more effective TypeScript developer. Practice using them in your projects!