The includes() method returns true if a string contains a specified string. Otherwise it returns false. The includes() method is case sensitive. Required. The string to search for. Optional. The …

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 …

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 …

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.

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.

Nov 5, 2021 · In JavaScript you can use the .includes() method to see if one string is found in another. Here is the basic syntax for the .includes() method. If the search-string is found then it …

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.

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 …

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.

Dec 16, 2021 · The JavaScript Element `contains ()` method is used to check and see if an element is a descendant of another element or not. When we say “descendant” that means the …