Function Scope

JavaScript uses function scope, meaning each function creates its own scope.

Variables defined inside a function are not accessible from outside that function.

When declared within a function, variables using var, let, and const all have function scope and behave similarly.

function myFunction() {
var carName = “Volvo”; // Function Scope
}

function myFunction() {
let carName = “Volvo”; // Function Scope
}

function myFunction() {
const carName = “Volvo”; // Function Scope
}

Global JavaScript Variables

A variable declared outside of a function becomes Global.

let carName = “Volvo”;
// code here can use carName

function myFunction() {
// code here can also use carName
}

A global variable has global scope, meaning it can be accessed by all scripts and functions on a web page.