Let textIsPresent = title.includes('Intelligent') To check whether variable title contains string Intelligent, we can use () as follows let title = '12 Ways to Tell Someone Is Really Intelligent' Let’s say you following string let title = '12 Ways to Tell Someone Is Really Intelligent' Old way: Before ES6, () method was used to check whether a string contains a substring, which returns -1 when a substring cannot be found. It returns a boolean value of true if the string is found, otherwise false. () method checks if one string may be found within another string. The string.includes() method is case-sensitive.In this tutorial, I am going to show you a very simple, fast, and modern(ES6) way to check whether a string contains a substring in JavaScript. The string.includes() method returns the boolean "true" if the string contains a substring otherwise, it returns "false". The method was introduced in ES6 and is generally preferred for simple use cases. In JavaScript, the string.includes() method determines whether a string contains the given substring. Checking if a string contains a substring using the string.includes() method You can split, concatenate, trim and reverse strings find the length of a string and check if it starts or ends with another string, and much more. JavaScript has a wide range of methods for working with strings. Strings in JavaScript are primitive and immutable data types, meaning they cannot be changed once created. JavaScript strings can contain Unicode characters encoded using the \uXXXX syntax. What is String in JavaScript?Ī JavaScript string is a sequence of one or more characters, which can be letters, numbers, or symbols. JavaScript is also widely used on the server side (Node.js), allowing developers to use JavaScript to write command-line tools and run server-side scripts. Currently, 98% of websites use JavaScript to program the behavior of web pages, and all major web browsers support it. JavaScript is the primary programming language for the web. JavaScript is a scripting language used in browsers to build powerful web applications and build high-performance web servers (NodeJs).
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