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includes() function with example in JavaScript

JavaScript includes() function: Here, we are going to learn about the includes() function with example in JavaScript, how and when it is used?
Submitted by IncludeHelp, on February 01, 2019

includes() is a predefined function in JavaScript, which is used to check whether a given element exists in the array or not?

Example:

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

<body>
	<script>
		//array
		var cities = ["New Delhi", "Mumbai", "Chennai", "Banglore"];
		
		//checking whether "New Delhi" exists or not
		if(cities.includes("New Delhi")==true)
			document.write("New Delhi exists in the array");
		else
			document.write("New Delhi does not exist in the array");
		document.write("<br>");

		//checking whether "Pune" exists or not
		if(cities.includes("Pune")==true)
			document.write("Pune exists in the array");
		else
			document.write("Pune does not exist in the array");
		document.write("<br>");		
	</script>
</body>
</html>

Output

New Delhi exists in the array
Pune does not exist in the array

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