# Javascript  Array Methods

# Join
### *Joins array elements using provided separator and returns a string.*

``` 
var numbers = [1, 2, 3, 4, 5];
var result = numbers.join(',');
console.log(result);
// Output: "1,2,3,4,5"
``` 
# Reverse
### *Reverse the order of elements in the array. *

``` 
var numbers = [1, 2, 3, 4, 5];
var result = numbers.reverse();
console.log(result);
// Output:  [5, 4, 3, 2, 1]
``` 
# Sort
### *It Sorts array elements using default sorting. *

``` 
var numbers = [2, 3, 1, 5, 4];
var result = numbers.sort();
console.log(result);
// Output:  [1, 2, 3, 4, 5]
``` 
# Concat
### *Creates and return a new array that contains the concatenation of arrays on which it is invoked. *

``` 
var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];
var result = arr1.concat(arr2)
console.log(result, arr1);
// Output:  [1, 2, 3, 4, 5, 6], [1, 2, 3]
``` 
# Slice
### * Returns a slice(subarray) of the array. but it will not affect the existing array *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.slice(0,2)
console.log(result, arr1);
// Output:  [1, 2], [1, 2, 3, 4, 5]
``` 

# splice
### * General purpose method for insertion and removal. It will affect the existing array. *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.splice(0,2)
console.log(result, arr1);
// Output:  [1, 2], [3, 4, 5]
```

# push
### * Append One more element to the array *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.push(6)
console.log(arr1);
// Output:  [1, 2, 3, 4, 5, 6]
```
# pop
### * Deletes the last element of the array and returns the element. *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.pop()
console.log(result, arr1);
// Output:  5, [1, 2, 3, 4]
```
# shift
### * Removes and return first element of array. *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.shift()
console.log(result, arr1);
// Output:  1, [2, 3, 4, 5]
```
# unshift
### * Add one more element to the beginning of the array, and will return the current length of the array. *

``` 
var arr1 = [1, 2, 3, 4, 5];
var result = arr1.unshift(7)
console.log(result, arr1);
// Output:  6, [7, 1, 2, 3, 4, 5]
```
# indexOf
### * Return the index of a specified element(start from 0) otherwise return -1

``` 
var arr1 = [1,2,3,4,5];
var result = arr1.indexOf(4)
console.log(result);
// Output:  3
var result = arr1.indexOf(7)
console.log(result);
// Output:  -1
```