sharp-collections | TypeScript LINQ library implementing all .NET LINQ methods | Database library
kandi X-RAY | sharp-collections Summary
kandi X-RAY | sharp-collections Summary
Sharp Collections is new and modern LINQ library for TypeScript (can be used with JavaScript also). This is the library that you want to use for collections in TypeScript. It implements all of .NET Linq methods and some more (first, groupBy, groupJoin, orderBy, select, singleOrDefault, join, where etc.).
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QUESTION
I can’t find a simple working example of the use of Map.fold
anywhere. I have seen the F# for fun and profit and the MSFT documents on ‘fold’.
Can you provide a short working example of the use of Map.fold
?
ANSWER
Answered 2021-Mar-13 at 23:13let capitals =
[("Australia", "Canberra"); ("Canada", "Ottawa"); ("China", "Beijing");
("Denmark", "Copenhagen"); ("Egypt", "Cairo"); ("Finland", "Helsinki");
("France", "Paris"); ("Germany", "Berlin"); ("India", "New Delhi");
("Japan", "Tokyo"); ("Mexico", "Mexico City"); ("Russia", "Moscow");
("Slovenia", "Ljubljana"); ("Spain", "Madrid"); ("Sweden", "Stockholm");
("Taiwan", "Taipei"); ("USA", "Washington D.C.")]
|> Map.ofList
printfn "%A\n" capitals
printfn "%s"
(Map.fold
(fun acc key value -> (acc + "(" + key + "," + value + ")"))
""
capitals)
QUESTION
I'm trying to invoke the Map.change
function. It's clearly defined in the documentation but it just doesn't work for me. I've tried opening different namespaces (such as FSharp.Core
, Microsoft.FSharp.Collections
), with no success.
ANSWER
Answered 2020-Nov-05 at 14:27Your code works (apart from the printf
). Maybe check your F# or .NET (Core) version. The Collections namespace doesn't have to be open.
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