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JavaScript concat() Method : Array Object

Description

The concat() method is used to join two or more arrays. Concat does not alter the original arrays, it returns a copy of the same elements combined from the original arrays.

Version

Implemented in JavaScript 1.2

Syntax

concat(arrayname1, arrayname2, ..., arraynameN)

Parameter

arrayname1, arrayname2, ..., arraynameN : Arrays to be joined to an array.

Example -1:

In the following web document two arrays arrayname1 and arrayname2 with single element have joined by concat() method.

HTML Code

<!DOCTYPE html>
<head>
<meta charset="utf-8" />
<title>JavaScript concat() method example on two arrays</title>
<meta name="description" content="This document contains an example of JavaScript Array constructor Property" />
<style type="text/css">
h1{color: red;}
</style>
</head>
<body>
<h1>JavaScript : concat() method</h1>
<script src="array-concat-example1.js"></script>
</body>
</html>

JS Code

var arrayname1 = new Array("USA");
var arrayname2 = new Array("INDIA");
var newarray = arrayname1.concat(arrayname2);
var newParagraph = document.createElement("p"); 
var newText = document.createTextNode(newarray);
newParagraph.appendChild(newText); 
document.body.appendChild(newParagraph);

View the example in the browser

Practice the example online

JavaScript concat() method example on two arrays

Example -2:

In the following web document three arrays array1, array2 and array3 with multiple elements have joined by concat() method.

HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf8" />
<title>JavaScript concat() method example on multiple arrays</title>
<style type="text/css">
h1 {color:red}
</style>
</head>
<body>
<h1>JavaScript : concat() method</h1>
<script src="array-concat-example2.js"></script>
</body>
</html>

JS Code

var array1=new Array(2);
array1[0] = "Fruits";
array1[1] = "Color";

var array2=new Array(2);
array2[0] = "Orange";
array2[1] = "Apple";

var array3=new Array(2);
array3[0] = "Banana";
array3[1] = "Cherry";

var joinarray=array1.concat(array2,array3);
var newParagraph = document.createElement("p"); 
var newText = document.createTextNode(joinarray);
newParagraph.appendChild(newText); 
document.body.appendChild(newParagraph);

View the example in the browser

Practice the example online

JavaScript concat() method example on multiple arrays

See also:

JavaScript Core objects, methods, properties.

Previous: JavaScript prototype Property: Array Object
Next: JavaScript join() Method: Array Object

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JavaScript: Tips of the Day

Returns the difference (in days) between two dates

Example:

const tips_DiffBetweenDates = (dateInitial, dateFinal) =>
  (dateFinal - dateInitial) / (1000 * 3600 * 24);
console.log(tips_DiffBetweenDates(new Date('2020-05-13'), new Date('2020-06-05')));

Output:

23