# Array Methods for Javascript Beginners

## let's Talk about what is an array 

In JavaScript, an Array is a data structure to store multiple elements in an ordered way. 

**Syntax **


```
// square brackets (usual)
let arr = [item1, item2...];

// new Array (Recent Update)
let arr = new Array(item1, item2...);
``` 
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## Array methods
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### Array Length 
Finding the total count of the elements in the array 

```
let fruits = ["Apple", "Orange", "Guava"];

alert( fruits.length );

 // 3 
```


### Adding elements to Array

**Pop()** removes the last element of an array and returns it

```
let fruits = ["Apple", "Orange", "Guava"];

alert( fruits.pop() ); 
// remove "Guava" and alert it

alert( fruits ); 
// *Output* : Apple, Orange
```


**Shift()** removes the first element of an array and returns it
```
let fruits = ["Apple", "Orange", "Guava"];

alert( fruits.shift() ); 
// remove Apple and alert it

alert( fruits ); 
// *Output* : Orange, Guava
```

### Adding elements to Array

**Push()** adds a new element to the end of an array 

```
let fruits = ["Apple", "Orange",];

fruits.push("Guava"); 
// Guava is added at the end

alert( fruits ); 
// *Output* : Apple, Orange, Guava
```


**Unshift()** adds a new element to the beginning of an array
```
let fruits = ["Orange", "Guava"];

fruits.unshift('Apple');
// Apple is added at the start

alert( fruits ); 
// *Output* : Apple, Orange, Guava
```
---

### Splice and Slice

**Splice** remove/replace elements or adding new elements

```
let arr = ["Apple", "Orange", "Guava"];

arr.splice(1, 1, "Grapes"); 
// from index 1 remove 1 element and add Grapes

alert( arr ); 
// *Output* : Apple, Grapes, Guava

//now arr = ["Apple", "Grapes", "Guava"]
```


**Slice** creates a new array, copies elements from *index *start till the end (not inclusive)
```
let arr = ["A", "B", "C", "D"];

alert( arr.slice(1, 3) ); 
// B,C (copy from 1 to 3)

alert( arr.slice(-2) );
// C,D (copy from -2 till the end)
```
---


I hope you found this to be helpful. I've categorized it simply so that you can quickly understand the ideas. These are the fundamentals. If you do some exploration, you'll discover more Array Methods.