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Array concat() method with example in JavaScript

JavaScript concat() method: Here, we are going to learn about the concat() method of array in JavaScript.
Submitted by IncludeHelp, on March 02, 2019

JavaScript concat() method

concat() method is used to join two or more arrays. It returns an array with elements of this array and elements of arrays which are passed as the parameters.

Syntax:

    array.fill(array1, array2, ...);

Parameters: One or more than one arrays, one array is required others are optional.

Return value: Array with the elements of this array and arrays passed as parameters

Example:

    Input:
    var arr1 = [10, 20, 30, 40, 50];
    var arr2 = [60, 70, 80, 90];

    Function call:
    var arr3 = arr1.concat(arr2);
    
    Output:
    10,20,30,40,50,60,70,80,90

JavaScript Code to demonstrate example of Array.concat() method

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
	<script>
		var arr1 = [10, 20, 30, 40, 50];
		var arr2 = [60, 70, 80, 90];
		var arr3 = arr1.concat(arr2);
		
		//printing arrays
		document.write("arr1: " + arr1 + "<br>");
		document.write("arr2: " + arr2 + "<br>");
		document.write("arr3: " + arr3 + "<br>");
		
		//joining two more than two arrays
		var arr4 = arr1.concat(arr1, arr3);
		document.write("arr4: " + arr4 + "<br>");
	</script>
</body>
</html>

Output

arr1: 10,20,30,40,50
arr2: 60,70,80,90
arr3: 10,20,30,40,50,60,70,80,90
arr4: 10,20,30,40,50,10,20,30,40,50,10,20,30,40,50,60,70,80,90





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