![]() indexOf ( 'nice', 3 ) != - 1 //false 'a nice string'. This method returns true if the string contains the. () Returns a number indicating whether the reference string compareString comes before, after. ![]() () Returns the index within the calling String object of the last occurrence of searchValue, or -1 if not found. indexOf ( 'nice' ) != - 1 //true 'a nice string'. The includes() method determines whether a string contains the characters of a specified string. Returns a boolean indicating whether this string contains any lone surrogates. Like includes(), the second parameters sets the starting point: 'a nice string'. If the substring is found, it returns the index of the character that starts the string. Pre-ES6, the common way to check if a string contains a substring was to use indexOf, which is a string method that return -1 if the string does not contain the substring. includes ( 'nice', 2 ) //true Pre-ES6 alternative to includes(): indexOf() includes ( 'nice', 3 ) //false 'a nice string'. The includes() method is a searching algorithm used to find a substring within a string or to find elements within an array. includes ( 'nice' ) //true 'a nice string'. Returns a value indicating whether a specified string occurs within this string, using the specified comparison rules. Includes() also accepts an optional second parameter, an integer which indicates the position where to start searching for: 'a nice string'. To use it on all browsers, use Polyfill.io or another dedicated polyfill. It’s supported in all modern browsers except Internet Explorer: This method was introduced in ES6/ES2015. The most simple one, and also the canonical one going forward, is using the includes() method on a string: 'a nice string'. JavaScript offers different ways to perform this operation. Learn the canonical way, and also find out all the options you have, using plain JavaScriptĬhecking if a string contains a substring is one of the most common tasks in any programming language. it will treat the Uppercase characters and Lowercase characters differently. Note: The includes () method is case sensitive i.e. This method returns true if the string contains the characters, otherwise, it returns false. ![]() JavaScript offers many ways to check if a string contains a substring. JavaScript String includes () method determines whether a string contains the given characters within it or not.
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