using a variable within a statement javascript code example

Example 1: how to define variable in javascript

var <variable-name>;

var <variable-name> = <value>;

Example 2: js variables

// let & var are both editable variables:
var cow = 'moo';
let pig = 'oink';
cow = 10;
pig = 10;
// const is a permanent variable; you cannot change it.
const uncuttableGrass = '\/\/';
uncuttableGrass = '___';
// above throws an error