Add System.Collections.ICollection implementations to F# list/set/map

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Idea 9183845: Add System.Collections.ICollection implementations to F# list/set/map

Status : planned
Submitted by Eirik George Tsarpalis on 8/5/2015 12:00:00 AM
10 votes

ICollection is a useful interface that inherits IEnumerable. Inputs implementing ICollection are utilized by libraries such as LINQ, Nessos.Streams and MBrace in order to optimize partitioning of data. Curiously, none of the F# collections (list/set/map) implement ICollection (however the latter two do implement ICollection, which is a different interface designed for mutable collections). It is currently impossible to extract the length/count of a boxed list/map without performing some sort of reflection, which is not always desirable.
I suggest that future versions of F# core implement this.
See also dotnet/fsharp#570 (comment)

Response

** by fslang-admin on 2/5/2016 12:00:00 AM **

Approved in principle, see my comment below
We will open an RFC for this in due course.
https://github.com/fsharp/FSharpLangDesign/tree/master/RFCs
Don Syme, F# Language Evolution
Archived Uservoice Comments