Javascript Array

Javascript Array.

Methods

• push(element)
  

Adds new items to the end of an array.
Parameters:
element - The element to be added at the end of the array.
Return:
The new length.

Note: this method will change the original array.

Ex:

var test_arr = [1,2];

var res = testarr.push(3);

// test_arr -> 1,2,3

// res -> 3

• pop()
  

Removes the last element of an array.
Return:
The removed element.
Note: this method will change the original array.

• concat(array1)
  
• concat(array1,array2,...)
  

Join two or more arrays.

Note: This method does not change the existing arrays, but returns a new array, containing the values of the joined arrays.

Ex: 
array1 = [1,2]
array2 = [2,3,4]
array3 = [4,5]
var res = array1.concat(array2, array3);
//res -> [1,2,2,3,4,4,5]

• join()
  
• join(separator)
  

The elements will be separated by a specified separator. The default separator is comma (,).

Note: This method will not change the original array.

• reverse()
  

Reverses the order of the elements in an array.

Note: this method will change the original array.

• shift()
  

• unshift()
  

• slice()
  

• splice()
  

   // Changes the content of an array, adding new elements while removing old elements.
   // Returns an array containing the removed elements
   // array.splice(index , howMany[, element1[, ...[, elementN]]])
   // array.splice(index ,[ howMany[, element1[, ...[, elementN]]]])

• sort()
  

• includes()
  

• indexOf()
  

• lastIndexOf()
  

Properties

• length
  

Returns the number of elements in an array.