Hackforge Academy

Explanation

JavaScript is a dynamically typed language, meaning variable types are decided at runtime. TypeScript is statically typed, meaning types are checked during development before execution.

Code:

// JavaScript
let age = 25;
age = "twenty five";

// TypeScript
let age: number = 25;
age = "twenty five"; // Error

Explanation

TypeScript provides type annotations to improve code safety and readability, while JavaScript does not support type annotations.

Code:

// TypeScript
function greet(name: string): string {
  return "Hello " + name;
}

Explanation

TypeScript catches errors during compile time, whereas JavaScript errors usually appear during runtime.

Code:

// TypeScript
let count: number = "10"; 
// Compile-time error

Explanation

TypeScript supports interfaces for defining object structure. JavaScript does not have built-in interfaces.

Code:

// TypeScript
interface User {
  name: string;
  age: number;
}

Explanation

TypeScript must be compiled into JavaScript before running in browsers, while JavaScript runs directly in browsers.

Code:

// Compile command
// tsc app.ts

Explanation

TypeScript provides advanced features like enums, generics, and access modifiers, which are not available natively in JavaScript.

Code:

// TypeScript enum example
enum Role {
  Admin,
  User
}

Explanation

JavaScript is easier for beginners to start quickly, while TypeScript is better suited for large-scale applications with better maintainability.

Code:

// JavaScript
console.log("Start quickly without setup");