collectionsf#

in F#, How do you merge 2 Collections.Map instances?

I am trying to merge two Maps, but there is no built in method for joining Collections. So how do you do it?

Solution

  • Define the following function:

    let join (p:Map<'a,'b>) (q:Map<'a,'b>) = 
    Map(Seq.concat [ (Map.toSeq p) ; (Map.toSeq q) ])

    example:

    let a = Map([1,11;2,21;3,31;])

let b = Map([3,32; 4,41;5,51;6,61;])

let c = join a b

    and the result: 

    val c : Map<int,int> =
  map [(1, 11); (2, 21); (3, 32); (4, 41); (5, 51); (6, 61)]