sarah posted

which method can be use dot check whether a string contains a substring in JavaScript?

eclipse-learner
answered May 1 '23 00:00

at JavaScript, you can use the includes() method to check whether a string contains a substring . The includes() method returns a boolean value indicating whether the specified substring is present in the string.

The syntax for using the includes() method is as follows:


string.includes(substring);

Here, string is the string you want to search in, and substring is the substring you want to search for.

For example, let's say you have a string "Hello, world!" and you want to check whether it contains the substring "world". You can use the includes() method as follows:



var str = "Hello, world!";
var result = str.includes("world");
console.log(result); // Output: true

In this example, the includes() method returns true because the substring "world" is present in the string "Hello, world!".

Note that the includes() method is case-sensitive, so it will only match substrings that have the same case as the string being searched. If you want to perform a case-insensitive search, you can convert both the string and the substring to lowercase or uppercase using the toLowerCase() or toUpperCase() methods before calling includes().

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sarah posted

which method can be use dot check whether a string contains a substring in JavaScript?

eclipse-learner answered May 1 '23 00:00

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eclipse-learner
answered May 1 '23 00:00