Saturday, December 04, 2021 20:02

Posts Tagged ‘IEnumerable’

Deferred execution

Wednesday, June 9th, 2021

A lot of people seem to think that deferred execution exists because of LINQ, and that is only partially true. LINQ does have a lot to do with it, but deferred execution exists first of all because of the yield statement.… Read more

Degenerate Select clauses

Monday, June 7th, 2021

Taking an excerpt code from the previous lessons about LINQ, we had these codes:


If you paid attention to the above code, you probably noticed the Select(n => n) function. If you analyze it a bit, you realize that it’s a lambda expression that all that it does is to take a parameter named n and return it, without any modification.… Read more

Writing custom LINQ extension methods

Monday, June 7th, 2021

In the previous lesson, when I introduced you to a preview of what LINQ looks like, I ended up with this code:


And we learned that the free form syntax of LINQ is the same thing as the declarative syntax of LINQ, which is also the same with some bunch of extension methods for the IEnumerable interface, declared inside a class called Enumerable.… Read more

LINQ

Monday, May 24th, 2021

Finally, we now know enough to start talking about LINQ, which is an acronym for Language Integrated Query which is basically just a fancy way of doing queries and SQL-like things in C#. If you don’t know what SQL is, you should probably research about it a bit first, but, at a macro level, SQL (Structured Query Language) is just a language for interacting with databases.… Read more

Yield break statement

Tuesday, May 11th, 2021

Whenever we use the yield keyword in a statement, we indicate that the method, operator, or get accessor in which it appears is an iterator. Of course, since we know that iterators are used to… duh! iterate on collections of data, and since we know that when iterating on a collection, we can use the break keyword to immediately terminate the iteration, it is only obvious that whenever we use an yield return statement to return values in an iterator, like I’ve shown in the previous lesson, we can also use yield break to terminate the iteration of the said iterator.… Read more

Yield return statement

Monday, February 22nd, 2021

In the previous lesson, I have talked about IEnumerable and IEnumerator, and how they help us when we need to iterate over collections of data. Let’s take an example that deals with those concepts:


C# IEnumerable

We have a function, GenerateRandomNumbers(), inside which we declare a List of ints, generate a number of random ints, equal to the _count parameter, add those random ints to the list, then return the list.… Read more

IEnumerator and IEnumerable

Friday, May 8th, 2020

Before we can start delving into LINQ, we need to first understand the underlying principles upon which it is built. LINQ is all about operations over collections, so, you’ve guessed it: we will be dealing with collections.

You already learned that of all data structures, arrays are the fastest, because they are unsorted non-generic data structures.… Read more


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