Var vs Const vs Let (JavaScript)

Variable Declarations

There are several ways of declaring values to variables in javascript:

• Var
• Const
• Let

Var

var stands for "variable" is used to declare variables that can be reassigned and are only available inside the function they're created in. They're function scoped.

var word = "hello"
console.log(word) // returns "hello"

word = "bye" // can be re-assigned ✅
console.log(word) // returns "bye"

---

Const

const stands for "constant" and is used to declare variables that cannot be reassigned and are not accessible before they appear within the code. They're block scoped.

const word = "hello"
console.log(word) // returns "hello"

word = "bye" // cannot be re-assigned ❌
console.log(word) // throws an error as constants cannot be re-assigned

---

Let

Variables declared using let can be reassigned but are similar to const i.e. block scoped. If variables are not created inside a function or block they are globally scoped.

• Block

  A block is a set of opening and closing curly brackets.

Hope you learned something useful today! Peace Out ✌️