JavaScript Scope

Scope in JavaScript determines where variables can be accessed in your code.

There are three types of scope:

1️⃣ Global Scope

A variable declared outside any function or block is global and can be accessed anywhere.

2️⃣ Function Scope (Local Scope)

Variables declared inside a function are local to that function and cannot be accessed outside.

3️⃣ Block Scope (ES6)

Variables declared with let and const inside { } are block-scoped.

📌 Scope Chain

Inner scopes can access variables from their outer scopes.

📌 Lexical Scope

JavaScript uses lexical (static) scope, meaning the scope is determined by the code structure, not runtime.

📌 Function vs Block Scope Chart

🧠 Best Practices

• Use let and const instead of var

• Keep variables in the smallest needed scope

• Reduce global variables to avoid conflicts

🚀 Summary