Conditional Types Development Tutorials, Guides & Insights

TypeScript is a powerful extension of JavaScript that adds static typing to your code, helping to catch errors early and improve overall code quality. One of the most powerful features of TypeScript is its support for generics and advanced types. These tools allow you to create more flexible, reusable, and type-safe code. In this cheatsheet, we’ll explore TypeScript’s generics and advanced types, helping you master complex type systems and take your TypeScript skills to the next level.

Generics are a way to create components or functions that can work with any data type while still maintaining type safety. This is particularly useful for creating reusable code.

function printId(id: number | string) {
  console.log('ID:', id);
}

printId(101);
printId('ABC123');

type Direction = 'up' | 'down' | 'left' | 'right';

function move(direction: Direction) {
  console.log('Moving', direction);
}

move('up'); // valid
move('right'); // valid
// move('forward'); // error