![]() ![]() However, you can easily polyfill this method: if (!String.prototype. Using the match() method: This method searches the string for a match against a regular expression, and returns an array containing the matched substrings, or. This method has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. The includes() method returns true if the string contains the specified characters, and false if not. For example, the following expression returns false: 'Blue Whale'.includes('blue') // returns false This method lets you determine whether or not a string includes another string. The includes() string method is used to search if a string contains another string within it or not. True if the search string is found anywhere within the given string otherwise, false if not. position Optional The position within the string at which to begin searching for searchString. Syntax str.includes( searchString) Parameters searchString A string to be searched for within str. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. ![]() ![]() The code example below shows how you can use the indexOf method to check if a string contains a substring in ECMAScript 5 or older.The source for this interactive example is stored in a GitHub repository. } Option 2: Use the indexOf Method (ECMAScript 5 or older) run this code if People is present in the str constant How string.includes () works in JavaScript bonsaiilabs 2.97K subscribers Subscribe 1.8K views 3 years ago JavaScript Browser JavaScript and Event Loop Course is available at. const str = 'We the People of the United States, in Order to form a more perfect Union.' Ĭonsole.log(str.includes('We the')) // trueĬonsole.log(str.includes('Order')) // trueĬonsole.log(str.includes('notpresent')) // falseĬonsole.log(str.includes('WE THE')) // false The code snippet below shows you how to use the includes method to check if a string contains a substring in ECMAScript 6. ![]() Option 1: Use the includes Method (ECMAScript 6) One of the ways is done using the includes method for JavaScript 6 (ECMAScript 6) and the other is with the indexOf for JavaScript 5 (ECMAScript 5) or older. There are two simple ways to check if a string contains a substring in JavaScript. ![]()
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