list of objects to Collections.map

Question

Given a list kinda like (simplified):

type foo(n:string,m:string,l:string) = 
    member f.name=n
    member f.val1=m
    member f.val2=l
let dates = [
    foo("a","aa","aaa")
    foo("b","bb","bbb")
]

How can a a immutable dictionary-type structure (eg, Map, IDictionary...any others?) of the form key:foo.name,value:foo be made?

My best guess was

let fooDict = for f in foo do yield f.name,f

But that for-comprehension syntax can only be used to make a list, array, or seq?

Answer 1

To create an immutable dictionary (the interface is mutable, but will throw an exception if you try to modify it)

[ for f in dates -> f.name,f ] |> dict

or

dates |> Seq.map (fun f -> f.name, f) |> dict

To create an immutable Map:

[ for f in dates -> f.name,f ] |> Map.ofSeq

or

dates |> Seq.map (fun f -> f.name, f) |> Map.ofSeq