‘amtrack’. In many cases, you need to check whether or not a string contains a. Read: How to remove a property from a Javascript Object Strings are pieces of text that can contain a variety of data such as URLs, phone numbers, names, numbers, and more. You can also pass an optional second parameter to indicate where to start searching. This method returns an integer with the position of the substring, and if it does not find the substring, it returns -1. ‘AMTRACK’.includes(‘M’, 1) // true Using the indexOf () methodīefore the release of the official method includes(), another way to check if a string contains a substring was to use the method indexOf(). You can optionally pass a second parameter to indicate where to start looking for the substring: Read: How to delete values from an array in Javascript ‘HI WORLD’.toLowerCase().includes(‘world’) // true – javascript string lowercase Note that the method includes()is case sensitive, so if you want to search for an independent string if it is uppercase or lowercase, you can do the following: ‘Hi world’.includes(‘world’) // true – javascript includes string method The method includes()is the official way to check if a string is contained within another string. In JavaScript there are several ways to check whether a string contains a word or a substring. Checking if a string contains a word is a common task in any programming language.
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