In JavaScript, variables are like containers that store data. There are three ways to create (or declare) these containers: var, let, and const.

Let’s look at what makes them different! 🌟

1. var – The Old-School Way 📜

Scope: var works within the function it's declared in (function-scoped), so it can be used anywhere inside that function. 🌍

Hoisting: JavaScript "hoists" or moves var declarations to the top of the function, but only the declaration, not the value.

This can sometimes cause confusion. 😕

Example:

var name = "Alice"; // Variable declared with 'var'

1. let – The New Standard 🌱

Scope: let is block-scoped, which means it's only available inside the block (curly braces {}) where it’s declared.

This makes it more predictable. 🧱

Reassignable: You can change the value of a let variable if needed. 📝

Example:

let age = 25; // Variable declared with 'let'

age = 30;   // You can reassign it

1. const – The Permanent One 🔒

• Scope: Like let, const is also block-scoped. ⛓️

• Non-Reassignable: Once a value is assigned to a const variable, it can't be changed. This is used when you don’t want the value to change. ❌

Example:

const birthYear = 1995; // Variable declared with 'const'

birthYear = 2000; // Error! You can't change it

When to Use Them:

Use let when you need to update the variable’s value later.

Use const when the value should stay the same (like a constant).

Avoid var in modern JavaScript because let and const are more reliable.

By understanding let, const, and var, you'll write cleaner, more predictable JavaScript! 🎯

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