![]() ![]() ![]() ![]() If the returned value is not equal to -1, the string contains the substring.Ĭonst str = 'React is a popular JavaScript library.' const substr = 'JavaScript' const index = str. One of the most basic tasks in any programming language is determining whether a string contains a given substring.Here are some code examples: Node. ES2015: includes(str, searchValue) returns true if searchValue is found anywhere within str, false otherwise. Fastest way to check a string contain another substring in JavaScript Ask Question Asked 12 years, 2 months ago Modified 7 months ago Viewed 367k times 243 I'm working with a performance issue on JavaScript. And returns a true or false value as appropriate. The search-string parameter is the string you are searching for in str. The includes() method returns true if a string contains a specified string. Call the String.indexOf() method on the given string, passing it to the substring as a parameter. How do you use the string.includes () method in Node.js The includes () method determines whether one string has another string inside of it. JavaScript String Contains How to use JS.To check if a string contains a substring in JavaScript: ![]()
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