how to initialize variable in javascript code example

Example 1: how to instialise var in js

var variable-name = number;
/*eg*/
var a = 10;

Example 2: how to declare variables javascript

//variables are a way to easily store data in javascript
//variables are declared by the var keyword, example...
var x = 10;
//or
var dog_name = "daisy";
//which can also be written as 
var dog_name = 'daisy';
//same thing with single quotes and double quotes