Let stringToSearchIn = mainString. Ĭonsole.log(str.toLowerCase().includes("String".toLowerCase())) //trueĬonsole.log(str.toUpperCase().includes("String".Let result = // Final output of all index's. One of the ways to solve the syntax error is to convert the string and the substring to the same case before searching. However, it could not locate String in the string JavaScript string contains is easy, because it is case sensitive. It return boolean which indicates if the sub-string included or not. The includes() method found the string substring in JavaScript string contains is easy. includes () string method to check for the existence of sub-string. Will we locate the substring if we capitalize one of its characters?Ĭonsole.log(str.includes("String")) // false The String.includes () provides the most simple and popular way to check if a string contains a substring in modern JavaScript. The part of the URL after ‘sysparmquery’ is the encoded query for that link.
Yes, the str string contains the string substring.Įxample-4: Using various capitalization cases An easy way to identify the encoded query string to use is to create a filter or a module with the query parameters you want to use, and then hover over the link or breadcrumb and look at the URL. Ĭonsole.log(str.includes("string", -3)) // true Here is an example using a negative index. Specifying a starting index less than the substring's leads to searching the substring throughout the entire string. But does it start at index 13?Įxample-3: Using a substring and a negative starting position It is true that the string substring starts at index 11 in the str string. Ĭonsole.log(str.includes("string", 11)) // true We can also check whether the target substring is located at a specific index. It is true that the string JavaScript string contains is easy contains the string substring.Įxample-2: Using a substring and a starting position
Now let's dive into practical examples of the includes() method.Ĭonst str = document.querySelector('p').textContentĬonsole.log(str.includes("string")) // true
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