How to Declare Multiple Variables at Once in JavaScript

Variables are a fundamental part of any programming language, especially JavaScript.

Declaring variables is how you define a variable in JavaScript that you can optionally give a value to.

In this post, we'll look at how to declare multiple variables in JavaScript.

Declaring multiple variables using commas

The most common way to declare multiple variables in JavaScript is to use commas to separate the variable names.

JAVASCRIPT
let firstName, lastName, age;

This is the same as declaring each variable individually.

JAVASCRIPT
let firstName;
let lastName;
let age;

You can also initialize them with values:

JAVASCRIPT
let firstName = "John", lastName = "Doe", age = 35;

You can improve readability by declaring each variable on a separate line:

JAVASCRIPT
let firstName = "John",
    lastName = "Doe",
    age = 35;

Another way you can define multiple variables is by using an array:

JAVASCRIPT
let [firstName, lastName, age] = ["John", "Doe", 35];

This can be useful especially when you don't control the values of the array and want to define variables for each value.

Keep in mind that if the value of the variable is not going to change, you should use const instead of let.

Conclusion

In this post, we looked at how to declare multiple variables in JavaScript.

You can declare multiple variables using commas or by using an array, whichever makes the most sense for you.

Thanks for reading!

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