🧠 What is const in JavaScript?

const is a way to create a variable in JavaScript, but one that cannot be changed later.
It stands for “constant” — something that stays the same.

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📌 Basic Rule

Once you give a value to a const variable, you cannot change that value.

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🧾 Syntax

const name = "John";

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✅ Easy Examples

1. Constant value:

const pi = 3.14;
console.log(pi); // 3.14

// You can't change it later:
// pi = 3.14159; // ❌ This will give an error

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2. With an array (list of items):

const colors = ["red", "blue"];
colors.push("green"); // ✅ You can add items
console.log(colors); // ["red", "blue", "green"]

// colors = ["yellow"]; // ❌ Not allowed: you can't assign a new array

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3. With an object:

const user = { name: "Alice", age: 25 };
user.age = 26; // ✅ You can change properties
console.log(user); // { name: "Alice", age: 26 }

// user = { name: "Bob" }; // ❌ Not allowed

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💡 When Should Beginners Use const?

• When the value shouldn’t change (like a name, total, or settings).
• It helps avoid mistakes and makes your code easier to read.

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