JavaScript Global Variables
What are global variables in JavaScript?
JavaScript Global Variables can be accessed outside any function or block. JavaScript global variables are declared within the window object or outside any block or scope.
A variable declared without a keyword is also considered global even though it is declared in the function.
Below are some examples to see the declaration and use of JavaScript global variables.
Example 1: In this example, we will see the declaration of global variables and accessing them.
Javascript
// Global variable let courseName = 'w3wiki'; function myFunction() { console.log(courseName); } myFunction() |
Output
w3wiki
Example 2: In this example, we will declare a global variable inside a function and access it outside that function.
Javascript
function myFunction() { // Considered global courseName = 'w3wiki'; console.log( courseName ); } myFunction(); console.log( courseName ); |
Output
w3wiki w3wiki