this's function and benefit

That is quite obvious. Here you have a generic method that will return a type of object/value that you specify in your code. So your code will be typesafe and you will not be forced to rewrite the code for every new type you introduce. A predicate is just a function that returns true or false and by supplying such a function to this method you can specify the criterion of what to return simply by detecting this in the predicate function and returning true when the criterion is met. Since the method only demands an IEnumerable<T> you can pass pretty much every Collection of objects/values into it, so this makes the usage of said method very flexible.

Any doubts left?

Regards,

Manfred

this might be helpful,

FirstOrDefault[^] and read the rest of the article which might help you to understand it.

Hope it helps :)

It's an extension method to a generic IEnumerable which returns the first value which passes a supplied test, or returns the default value if no such value is found.

What you can do with it is call it on any generic collection (such as a List, or an array) which a specific test method supplied and it will give you the appropriate value.

For example:

List<string> list = new List<string>();
list.Add("hello");
list.Add("goodbye");
string f = list.FirstOrDefault(v => v.StartsWith("h"));

Will give me f containing "hello".
If I hadn't added "hello" to the list of strings, f would be null - the default value for a uninitialised string.