Basic Types in TypeScript

TypeScript provides several primitive types that form the foundation of its type system. Understanding these types is essential to using TypeScript effectively.

Primitive Types

1. string

The string type represents text strings:

let nom: string = "Alice";
let message: string = `Bonjour ${nom}`;
let description: string = 'Développeuse TypeScript';

// Template literals
let html: string = `
  <div>
    <h1>${nom}</h1>
    <p>${description}</p>
  </div>
`;

2. number

The number type represents all numbers (integers and decimals):

let age: number = 25;
let prix: number = 19.99;
let hexadecimal: number = 0xf00d;
let binaire: number = 0b1010;
let octal: number = 0o744;

// Opérations mathématiques
let total: number = prix * 2;
let moyenne: number = (10 + 20 + 30) / 3;

3. boolean

The boolean type represents true or false values:

let estActif: boolean = true;
let estComplete: boolean = false;

// Résultat d'expressions
let estMajeur: boolean = age >= 18;
let aAcces: boolean = estActif && estMajeur;