The includes() method returns true if a string contains a specified string. Otherwise it returns false. The includes() method is case sensitive.

In this tutorial, you will learn how to use the JavaScript contains() method to check if a node is a descendant of a given node.

Nov 24, 2009 · ECMAScript 6 introduced String.prototype.includes: String.prototype.includes is case-sensitive and is not supported by Internet Explorer without a polyfill. In ECMAScript 5 or …

Apr 6, 2022 · The contains() method is used to check whether or not a collection contains a specific item. If the item is present, it returns true; otherwise, it returns false. The function is …

Mar 13, 2025 · The includes() method of String values performs a case-sensitive search to determine whether a given string may be found within this string, returning true or false as …

Jun 15, 2023 · The contains () method is used to find whether the specified node is a descendant of the given node. This descendant can be a child, grandchild, great-grandchild, and so on. …

Nov 5, 2021 · In JavaScript you can use the .includes() method to see if one string is found in another. But how does it work exactly? In this article, I will walk you through a few code …

The contains method allows you to check if one element contains another within itself. The method parameter passes an element that will be checked for being inside the element to …

Jan 7, 2021 · You can check if a JavaScript string contains a character or phrase using the includes() method, indexOf(), or a regular expression. includes() is the most common method …

May 2, 2023 · The includes method is a built-in function that determines whether a string contains the specified substring. The method returns true if the substring is found, and false otherwise.