This is quite simple question but I didn't find an answer:

Is there any Seq/List operation in F# to match the LINQ SelectMany?

• I know I can use System.Linq in F# if I want to.
• I know I can make a recursive method and use F# Computation Expressions (and make even more powerful things).

But if I try to prove that F# List operations are more powerful than LINQ...

• .Where = List.filter
• .Select = List.map
• .Aggregate = List.fold
• ...

In C# SelectMany usage syntax is pretty simple:

var flattenedList = from i in items1
                    from j in items2
                    select ...

Is there any easy direct match, List.flatten, List.bind or something like that?

SelectMany has a couple of signatures, but the most complex one seems to be:

IEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(
    this IEnumerable<TSource> source, 
    Func<TSource, IEnumerable<TCollection>> collectionSelector, 
    Func<TSource, TCollection, TResult> resultSelector
);

In F# terms this would be:

('a -> 'b list) -> ('a -> 'b -> 'c) -> 'a list -> 'c list