Introduce array spread operator for pattern matching and [<ParamArray>]

[baronfel]

Introduce array spread operator for pattern matching and [] [11462964]

Submitted by Ryan Riley on 1/15/2016 12:00:00 AM
18 votes on UserVoice prior to migration

Several languages have introduced a handy spread operator, ..., that can be used to pick up remaining arguments to a function call or when destructuring values. [1] This would be incredibly helpful in F# to reduce boilerplate in methods accepting a [] or when trying to pattern match arrays:
match [|1;2;3;4|] with
| [||] -> // do stuff with empty array
| [|hd;…tl|] -> // do stuff with hd/tl
[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator

Response

** by fslang-admin on 2/3/2016 12:00:00 AM **

Declined per my comment below. We would not extend pattern matching for this one case, but Rick is right that improvements to active patterns may make sense
Don Syme, F# Language Evolution

Original UserVoice Submission
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