If the required value is not found in the array during the search, the method will return undefined. The find() method must be specified in binding to an array, so it must be declared before the method initialization.

At the same time, it accepts various conditions for search criteria, which makes it possible to use it, including with complex functions. The find() method allows you to check for the presence of a certain value in an array, in cases when you do not know its index. For direct requests for indexes and array values, there are several methods, each with its own characteristics. Therefore, it is much easier to work with data (elements) in arrays, since with just one line of code you can replace, delete, or even create a selection of values based on a formal attribute. They are always available out-of-the-box and allow you to change or correct the structure and contents of arrays with just one line. In addition, arrays also have a large number of special methods for working with their elements. These are structures in JavaScript with unique names, and indexes used to address values within an array. If a program or a script works with different values united by some formal feature, it is most appropriate to use arrays to store them. Operators: Addition assignment operator (+=).

Javascript array find