Variable Type Annotations

Snippet

TypeScript allows you to explicitly state the data type of a variable. This helps catch errors if you try to assign the wrong type of data later.

snippet.ts
typescript
let username: string = "Alice";
const score: number = 100;
let isActive: boolean = true;

Breakdown

let username: string = "Alice";

Declares a variable named 'username' that must always be a string.

const score: number = 100;

Declares a constant 'score' that must always be a number.

let isActive: boolean = true;

Declares a boolean variable that can only be true or false.

From your library