JavaScript includes() method work with Array and String. Where it used with String to determines whether a string contains the characters of a specified string. And in Array determines whether an array contains a specified element.
Examples of JavaScript includes
Let’s the example of includes() method with Array and Strings.
JavaScript array includes an example
array.includes(element, start)check if an array includes “A”:
<!DOCTYPE html>
<html>
<head>
<script>
var alpha = ["B", "A", "C", "D"];
var n = alpha.includes("A");
alert(n)
</script>
</head>
</html>Output:
Read more:- Array includes method | check if a value exists
JavaScript string includes an example
Code snippet
string.includes(searchvalue, start)Let’s see if a string includes “world” word.
<!DOCTYPE html>
<html>
<head>
<script>
var str = "Hello world, welcome to the EyeHunts.com";
var n = str.includes("world");
alert(n)
</script>
</head>
</html>Output:
Read more:- String includes method | Search one string into another string
Q: How to javascript includes() case insensitive can work?
Answer: You can try this, Add .toLowerCase() after referrer. This method turns the string in a lower case string.
str = "Wow its so COOL"
searchStr = "CoOl"
console.log(str.toLowerCase().includes(searchStr.toLowerCase()))Q: JavaScript includes not working in All browsers.
Answer: If you look at the documentation of includes(), most of the browsers don’t support this property.
You can use widely supported indexOf() after converting the property to string using toString():
Read this:- Javascript indexof Method | Search specified item/string in the Array/String
Do comment if you have any doubts and suggestion on this article.
Note: The All JS Examples codes are tested on the Safari browser (Version 12.0.2) and Chrome.
OS: macOS 10.14 Mojave
Code: HTML 5 Version