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

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

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.