![]() RegExp.prototype has a test method which returns a boolean. ![]() However, that does point us toward something else useful. The syntax of this function is as follows: str.includes (searchString, position) Arguments The first argument to this function searchString is the string to be searched in the given string. The String.includes () method returns true if the string contains the specified substring. It was introduced in ES6 and works in all modern browsers except Internet Explorer. The includes() method checks if one string can be. Unfortunately, with the exception of matching on a regular expression rather than a string, the behavior is identical to indexOf. JavaScript str.includes () function is used to check if the argument string is present in the given string or not. The String.includes () provides the most simple and popular way to check if a string contains a substring in modern JavaScript. In this tutorial, we will learn about the JavaScript String includes() method with the help of examples. Looking through the documentation for String.prototype, the search method looks promising due to its name. Ideally, what we're looking for is a method with a name that matches our intention (determining if x contains y), and returns a simple true or false. That means that we can use it, but the clarity of the code suffers. The includes() method determines whether one string may be found within another string, returning true or false as appropriate. To check if a string str1 contains a specified string str2 in JavaScript, call includes() method on the string str1, and pass the specific string str2 as. ![]() In the event that no match is found, it will return -1. O método includes () determina se um conjunto de caracteres pode ser encontrado dentro de outra string, retornando true ou false. Its job is to return the index at which a given substring is found. El método includes () es intencionalmente genérico. While indexOf is often recommended as a simple way to test for the presence of a substring, that's not really its purpose. Var philosophers = "Aquinas, Maimonedes, and Avicenna" var me = "Joshua" function printPhilosopherStatus ( person ) // Outputs: "Joshua is NOT a philosopher." printPhilosopherStatus ( me )
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