Course/Module 3/Topic 3 of 3Beginner

Interfaces & Type Aliases - Practice

Put your interfaces & type aliases skills to the test with practical exercises and challenges.

50 min•By Priygop Team•Last updated: Feb 2026

Hands-On Practice

Practice makes perfect! In this section, you'll work through practical exercises that reinforce the concepts covered in this module.

Exercises

Exercise 1: Apply basic interfaces & type aliases concepts
Exercise 2: Solve intermediate-level challenges
Exercise 3: Build a mini-project using interfaces & type aliases
Exercise 4: Debug and fix common issues

Practice: Interfaces & Type Aliases

Practice: Interfaces & Type AliasesJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected identifier 'Product'

💡 Check syntax near the highlighted line.

JavaScript Editor

✕ 1 errorTab = 2 spaces

// Define your own interface!
interface Product {
  id: number;
  name: string;
  price: number;
  inStock: boolean;
  tags?: string[];
}

const laptop: Product = {
  id: 1,
  name: "MacBook Pro",
  price: 2499,
  inStock: true,
  tags: ["electronics", "premium"]
};

console.log(`${laptop.name}: $${laptop.price}`);
console.log("In stock:", laptop.inStock);

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

JavaScript|19 lines|358 chars|1 error, 0 warnings

UTF-8

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