Generics Development Tutorials, Guides & Insights

function getProperty<T, K extends keyof T>(obj: T, key: K) {
  return obj[key];
}

const point: Point = { x: 10, y: 20 };
const xValue = getProperty(point, "x");

The infer keyword allows you to extract and work with types within conditional types. It's particularly useful in more complex type manipulations.

This function works with any array type and returns the first element, maintaining the type of the elements.

Generics can also be applied to classes, allowing for the creation of flexible and reusable data structures.

TypeScript’s type inference allows the compiler to determine types automatically without explicit annotations.

let name = 'Alice'; // inferred as string
let age = 30;       // inferred as number
let isDeveloper = true; // inferred as boolean