Harnessing LINQ methods as higher-order functions

Language Integrated Query (LINQ) in C# integrates query capabilities into the language, functioning primarily through extension methods. These methods, adhering to functional programming principles, allow for concise and expressive data manipulation. We’ll explore how LINQ can be effectively used in different systems for data filtering, transformation, and aggregation.

Filtering

In a video management system, we might need to filter videos based on their view count. Using the Where method, we can easily achieve this:

List<Video> videos = GetAllVideos();
 IEnumerable<Video> popularVideos = videos.Where(video => video.Views > 100000);
foreach(var video in popularVideos)
{
    Console.WriteLine(video.Title);
}

Data transformation

In a publishing system, converting book titles to uppercase for a uniform catalog display can be done using the Select method:

List<Book> books...