Global Variables in Javascript

A JavaScript global variable is declared outside the function or declared with window object. It can be accessed from any function. Let's see the simple example of global variable in JavaScript.

1. How are global variables created in JavaScript?
2. Should I use global variables in JavaScript?
3. What is an example of a global variable?
4. Where are global variables stored in JavaScript?

How are global variables created in JavaScript?

A global object is an object that always exists in the global scope. In JavaScript, there's always a global object defined. In a web browser, when scripts create global variables defined with the var keyword, they're created as members of the global object.

Should I use global variables in JavaScript?

Avoid globals. Global variables and function names are an incredibly bad idea. ... If you have global variables or functions in your code, scripts included after yours that contain the same variable and function names will overwrite your variables/functions.

What is an example of a global variable?

A Global Variable in the program is a variable defined outside the subroutine or function. ... Hence, it can be accessed throughout the program by any function defined within the program, unless it is shadowed. Example: int a =4; int b=5; public int add() return a+b; Here, 'a' and 'b' are global variables.

Where are global variables stored in JavaScript?

Are global variables stored in specific object? The answer is yes; they are stored in something called, officially, the global object. This object is described in Section 15.1 of the official ECMAScript 5 Specification.