2.9 JavaScript ES6+ Features – Modern JavaScript Syntax Made Easy

Hey Web Codders! 👋
This is Vikas Sankhla, your tech buddy and founder of the Web Codder YouTube channel.
Today, we’ll learn how to make JavaScript code shorter, cleaner, and smarter using ES6+ features. 💡

Let’s go step by step and make it crazy simple. 😎

🎁 1. Destructuring Assignment – Unpacking Like a Pro

Destructuring lets you pull out values from arrays or objects quickly.

📦 Example with Arrays:

jsCopyEditlet fruits = ["🍎", "🍌", "🍇"];
let [apple, banana, grape] = fruits;

console.log(apple); // 🍎

No more fruits[0], fruits[1]—you just grab them all in one line!

📦 Example with Objects:

jsCopyEditlet user = { name: "Vikas", age: 30 };
let { name, age } = user;

console.log(name); // Vikas

👉 Works great in functions too!

jsCopyEditfunction greet({ name }) {
  console.log(`Hello, ${name}! 👋`);
}

greet(user); // Hello, Vikas! 👋

✨ 2. Template Literals – String Magic 🎩

Tired of + everywhere in strings?

Use template literals with backticks (`) and ${} to insert variables easily.

Old way:

jsCopyEditlet name = "Web Codder";
console.log("Hello, " + name + "!");

New way with Template Literals:

jsCopyEditconsole.log(`Hello, ${name}! 👋`);

✅ Cleaner
✅ Easy to read
✅ Multi-line support!

jsCopyEditconsole.log(`
Welcome, ${name}!
You're awesome. 😎
`);

⚙️ 3. Default, Rest & Spread – The Trio of Power 💪

🔹 Default Parameters – Set values if nothing is passed

jsCopyEditfunction greet(name = "Guest") {
  console.log(`Hello, ${name}!`);
}

greet(); // Hello, Guest!

🔹 Rest Parameters – Catch all extras into an array

jsCopyEditfunction addAll(...nums) {
  return nums.reduce((a, b) => a + b);
}

console.log(addAll(1, 2, 3, 4)); // 10

🔹 Spread Operator – Spread things out

Copy or merge arrays/objects easily.

jsCopyEditlet nums1 = [1, 2];
let nums2 = [...nums1, 3, 4];

console.log(nums2); // [1, 2, 3, 4]

🗺️ 4. Map, Set, WeakMap, WeakSet – New Data Structures

🔹 Map – Key-value pairs (better than plain objects!)

jsCopyEditlet myMap = new Map();

myMap.set("name", "Vikas");
myMap.set("channel", "Web Codder");

console.log(myMap.get("name")); // Vikas

✅ Can use any type as key
✅ Keeps order
✅ Easy to iterate

🔹 Set – Unique values only

jsCopyEditlet mySet = new Set();

mySet.add("apple");
mySet.add("banana");
mySet.add("apple"); // Duplicate ignored!

console.log(mySet.size); // 2

✅ No duplicates
✅ Great for filtering

🔹 WeakMap and WeakSet – Like Map/Set, but:

• Keys must be objects
• Don’t prevent garbage collection
• Used in advanced memory-sensitive use cases

You won’t need them much as a beginner, but it’s good to know they exist! 💡

📋 Summary Table

🧠 Final Thoughts

These modern features make JavaScript faster to write, easier to read, and more powerful. 💪

Start using these in your projects today and see the magic happen! ✨

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