JavaScript Arrays
JavaScript Arrays
In JavaScript Arrays is a special variable that can store multiple values in a single variable. Values inside an array are stored in a list format and separated by commas.
Creating an Array
1. Using Square Brackets (Most common)
2. Using new Array() (Less common)
Accessing Array Elements
Array index starts from 0.
Changing Array Elements
Array Properties
| Property | Example | Result |
|---|---|---|
length | fruits.length | Number of items in array |
Common Array Methods
| Method | Action |
|---|---|
push() | Add item to end |
pop() | Remove last item |
unshift() | Add item to start |
shift() | Remove first item |
sort() | Sort values |
reverse() | Reverse order |
Example:
Looping Through an Array
for loop:
forEach() method:
Array of Objects
Checking if Value is an Array
Summary
| Feature | Description |
|---|---|
| Store multiple values | In a single variable |
| Zero-based index | First item = index 0 |
| Built-in methods | push, pop, shift, sort, etc. |
| Easy looping | for or forEach |
Arrays are one of the most important parts of JavaScript and widely used in web development, especially in frameworks like React, Angular, and Vue.
