Array Concat Element Method

Add two array elements

Object: Array
Method or Function: concat(argument)
Syntax: array1.concat(array2,array3,...,arrayn)

concat() method takes two or more array elements and adds them to the end of array.
Useing the concat() method, returns a copy of an original string and the string passed by argument.
The concat() method does not modify the original string, and only a copy of the result is returned.

Example: 1

<script type="text/javascript">

         var month1 = new Array("January" , "February", "March", "April", "May", "June");
         var month2 = new Array("July", "August", "September", "October", "November", "December");

         var months=month1.concat(month2);

        document.write(months);

</script>

Output

January,February,March,April,May,June,July,August,September,
October,November,December

Another way to display array

Example: 2

 <script type="text/javascript">
        var month1 = new Array("January" , "February", "March", "April", "May", "June");
        var month2 = new Array("July", "August", "September", "October", "November", "December");

         var months=month1.concat(month2);

       for(i=0; i<months.length; i++)
        {
         document.write(months[i] + "<br>");
         }
</script>

Output

Here "month1" and "month2" are two arrays and "months" is another array that contains now the elements of "month1" and "month2" arrays.
We could use var months=month2.concat(month1);.
In this case, the order of elements will change.