JavaScript variables are used as container to store values, and they can be of any data type. You can declare variables using the var, let, or const keywords. JavaScript provides different ways to declare multiple variables either individually or in a single line for efficiency and readability.

Declaring Multiple Variables Individually

The most simple way to declare variables is to declare them one by one using var, let, or const keyword. You can directly assign values and can access them using the variable name.

Syntax

let x = 20;
let y = 30;
let z = 40;

Example: Declaring three different variables using let keyword.

let x = 20;
let y = 'G';
let z = "GeeksforGeeks";

console.log("x: ", x);
console.log("y: ", y);
console.log("z: ", z);

x:  20
y:  G
z:  GeeksforGeeks

Declaring Multiple Variables in a Single Line

You can declare multiple variables in one line using a comma-separated list with var, let, or const keyword. This approach can make the code more concise.

Syntax

let x = 20, y = 30, z = 40;

Example: Declaring and assigning three different variables at once.

let x = 20, y = 'G',
    z = "GeeksforGeeks";

console.log("x: ", x);
console.log("y: ", y);
console.log("z: ", z);

x:  20
y:  G
z:  GeeksforGeeks

Using Destructuring Assignment

Destructuring assignment is a modern feature in JavaScript that allows you to unpack values from arrays or properties from objects into distinct variables in a single line. This is especially useful when dealing with arrays or objects.

Syntax

const [var1, var2, var3] = [val1, val2, val3];

Example: Declaring three different variables by destructuring them at once.

const [x, y, z] = [20, 'G', "GeeksforGeeks"];

console.log("x: ", x);
console.log("y: ", y);
console.log("z: ", z);

x:  20
y:  G
z:  GeeksforGeeks