Guidelines to design a C# library well usable from F#

Question

I just want to point out that this is question is not the reverse of

Best approach for designing F# libraries for use from both F# and C#

Here I\'m not asking ho

Answer 1

Interop with existing .NET libraries was a major design goal of F#, so there aren't any constraints on the libraries to be consumed.

That said, because of F#'s stricter typing, there are some patterns that result in slightly clunkier code. The builder pattern is one.

var bldr = new StringBuilder();
bldr.Append("abc"); //ignoring return value

vs.

bldr.Append("abc") |> ignore //must be explicitly ignored

But this is easily worked around using an extension method or let-bound function. Bottom line: interop is one of F#'s strengths and greatest achievements.