🍯Variables

In JavaScript, a variable is a named storage location that holds a value. Variables are used to store values such as numbers, strings, arrays, and objects, and can be declared and initialized in a number of ways.

Here are some examples of declaring and initializing variables in JavaScript:

// Declare a variable with the keyword 'var'
var x;

// Initialize the variable with a value
x = 10;

// Declare and initialize a variable in one line
var y = 20;

// Declare and initialize a variable with the keyword 'let'
let z = 30;

// Declare and initialize a variable with the keyword 'const'
const a = 40;

The var keyword is used to declare a variable in JavaScript. It is important to note that variables declared with var are hoisted to the top of the current scope, which means that they can be accessed before they are declared. The let and const keywords were introduced in newer versions of JavaScript and behave differently than var. Variables declared with let can be reassigned, but not redeclared, within the same scope. Variables declared with const cannot be reassigned or redeclared within the same scope.

It is a good practice to use let or const instead of var whenever possible, as they provide more control over the behaviour of variables in your code.