From the course: Advanced C#: Functional Programming Patterns
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Join with SelectMany - C# Tutorial
From the course: Advanced C#: Functional Programming Patterns
Join with SelectMany
Here's another use for SelectMany. It's useful for creating Cartesian products from the two sequences. Now I'm using a simpler example here. I've got an immutable list of integers called odds and an immutable list of integers called evens. Before I show you the Cartesian product, let's look at just a basic concat method. There is a concat available in LINQ, and all that does is work with two flat sequences and it joins them end-to-end. I'll end up with a list here that contains six items: 3, 5, 7, and then 12, 14, and 16. If I want to perform an operation, remember, that's why we use select. We can perform an operation and we can transform it. I could transform the two lists into something else. In this case, it's a string. It's going to have the first number, 3. I'll say A, 3, and then B, 12, and then A, 3; B, 14, and so on. That's the Cartesian product. The way I work with that is shown here. So I call SelectMany. Now I've got the instructions or I should say the comments of what…
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