# Understanding Arrays in JavaScript

**Array is a special type of object which contains ordered list of values.**

Key of an array is indexed it starts from 0 and for each new element it keeps incrementing (0, 1, 2, 3, ......) it is defined by the JavaScript

### Creating an Array

**Empty object**

```js
let array = [];
```

**Array of numbers **

```js
let numbers = [12, 45, 49, 53];
```

**Array of strings**

```js
let fruits = ["Apple", "Banana", "Mango"];
```

**Mixed Array**

```js
let mixed = ['Hello!', true, undefined, 21];
```

**Example:**

**Declaration of an array**

To declare an array you need to specify the array name with the elements in it.

```js
let fruits = ["Apple", "Banana", "Mango"];
```
**Accessing**

*fruits[0]*

**Adding**

*fruits [3] = "Watermelon"*

**Updating**

*fruits[1] = "Papaya"*

**Deleting**

*delete fruits[2]*

#### Lenths:

Every array has special property called length which gives you the no. of elements in that array.