JavaScript String includes() Method Last Updated : 10 Jan, 2025 Comments Improve Suggest changes Like Article Like Report The includes() method returns true if a string contains a specified string. Otherwise, it returns false.Note: The includes() method is case sensitive i.e. it will treat the Uppercase Characters and Lowercase Characters differently.Syntax:string.includes(searchvalue, start)Parameters:search value: It is the string in which the search will take place.start: This is the position from where the search will be processed (although this parameter is not necessary if this is not mentioned the search will begin from the start of the string).Return Value:Returns either a Boolean true indicating the presence or it returns a false indicating the absence.Example 1: The code checks if the string "Geeks" is present in the string "Welcome to GeeksforGeeks.". It then logs the result, which is true, since "Geeks" is indeed present in the string. javascript let str = "Welcome to GeeksforGeeks."; let check = str.includes("Geeks"); console.log(check); Outputtrue Example 2: Here, the second parameter is not defined, so the search will take place from the starting index. But as this method is case sensitive it will treat the two strings differently, hence returning a boolean false. javascript let str = "Welcome to GeeksforGeeks."; let check = str.includes("geeks"); console.log(check); Outputfalse Example 3: The code checks if the character "o" is present in the string "Welcome to GeeksforGeeks." starting from index 17. It then logs the result, which is false, since "o" is not present in the substring starting from index 17. javascript let str = "Welcome to GeeksforGeeks."; let check = str.includes("o", 17); console.log(check); Outputtrue Example 4: If the computed index (starting index) i.e. the position from which the search will begin is less than 0, the entire array will be searched. javascript let str = "Welcome to GeeksforGeeks."; let check = str.includes("o", -2); console.log(check); Outputtrue Supported Browsers:Google Chrome 51 Edge 15 Firefox 54Opera 38Safari 10 Comment More infoAdvertise with us GeeksforGeeks Improve Article Tags : Misc JavaScript Web Technologies javascript-string JavaScript-Methods +1 More Practice Tags : Misc Similar Reads JavaScript String() Constructor The JavaScript String() Constructor is used to can be used as a constructor or a function. that creates a new string object. 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