JavaScript Arrays

Subject: JavaScript

In JavaScript, an array is a data structure used to store multiple values in a single variable. Arrays are ordered, indexed collections capable of holding values of any type — including strings, numbers, objects, or even other arrays.

What Is an Array in JavaScript?

An array groups related values and gives access to each one using a numeric index.

Each element has an index starting from 0.

Creating Arrays

Using Square Brackets (Preferred)

Using new Array() Constructor

Creating an Empty Array

Accessing Array Elements

Use the index (starting from 0):

Modifying Array Elements

Array Length

Looping Through Arrays

Using for loop

Using for...of loop

Using forEach()

Array of Objects

Arrays can store objects as elements:

Multidimensional Arrays

Arrays can also contain other arrays:

Key Takeaways

Arrays store multiple values using index-based access.
Use square brackets [] to create or access arrays.
JavaScript offers many built-in methods to work with arrays efficiently.
Arrays can contain different data types, including objects and other arrays.
Looping methods (for, for...of, forEach) help in iterating array values.

Next : Array Methods