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JavaScript concat() Method

Array Object Reference JavaScript Array Object

Definition and Usage

The concat() method is used to join two or more arrays.

This method does not change the existing arrays, it only returns a copy of the joined arrays.

Syntax

arrayObject.concat(arrayX,arrayX,......,arrayX)

Parameter Description
arrayX Required. One or more array objects to be joined to an array

Examples

Example 1

Here we create two arrays and show them as one using concat():

<script type="text/javascript">

var arr = new Array(3);
arr[0] = "Jani";
arr[1] = "Tove";
arr[2] = "Hege";

var arr2 = new Array(3);
arr2[0] = "John";
arr2[1] = "Andy";
arr2[2] = "Wendy";

document.write(arr.concat(arr2));

</script>

The output of the code above will be:

Jani,Tove,Hege,John,Andy,Wendy

Try it yourself »

Example 2

Here we create three arrays and show them as one using concat():

<script type="text/javascript">

var arr = new Array(3);
arr[0] = "Jani";
arr[1] = "Tove";
arr[2] = "Hege";

var arr2 = new Array(3);
arr2[0] = "John";
arr2[1] = "Andy";
arr2[2] = "Wendy";

var arr3 = new Array(2);
arr3[0] = "Stale";
arr3[1] = "Borge";

document.write(arr.concat(arr2,arr3));

</script>

The output of the code above will be:

Jani,Tove,Hege,John,Andy,Wendy,Stale,Borge

Try it yourself »

Array Object Reference JavaScript Array Object

From http://www.w3schools.com (Copyright Refsnes Data)