JavaScript concat() Method

Complete Array Object Reference

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)

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

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 Demos

How to join two arrays with the concat() method

How to join three arrays with the concat() method

Complete Array Object Reference

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