TypeScript for JavaScript Developers TypeScript adds static type checking to JavaScript, helping you catch errors early and write more maintainable code. Basic Type Annotations Add type annotations to variables and functions: // Variables let name: string = 'John'; let age: number = 30; let isActive: boolean = true; // Functions function greet(name: string): string { return `Hello, ${name}!`; } // Arrays let numbers: number[] = [1, 2, 3, 4, 5]; let names: string[] = ['Alice', 'Bob', 'Charlie...
