Comments (4)
iyegoroff
commented on June 28, 2024
1
@Zaid-Ajaj , @alfonsogarciacaro thanks for the answers!
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forki
commented on June 28, 2024
/cc @alfonsogcnunez @MangelMaxime
iyegoroff <[email protected]> schrieb am Mo., 11. Juni 2018, 04:52:
… Why do you use types like Func<x, y, z> instead of (x -> y -> z) almost
everywhere? It seems that second signature is easier to use:
with Func's
let renderItem (item: FlatListRenderItemInfo<'a>) =
//...
R.flatList items
[ RenderItem (Func<_, _>renderItem)
KeyExtractor (Func<_, _, _>(fun item _ -> itemKey item)) ]
with arrows
let renderItem (item: FlatListRenderItemInfo<'a>) =
//...
R.flatList items
[ RenderItem renderItem
KeyExtractor (fun item _ -> itemKey item) ]
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Zaid-Ajaj
commented on June 28, 2024
@iyegoroff if Func is being used in the API then it is out-dated. x -> y -> z should be used because it compiles down to the uncurried version of the function i.e. function (x, y) { return z; } for better inter-operability and it can still be partially applied.
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alfonsogarciacaro
commented on June 28, 2024
It's as @Zaid-Ajaj says :) Originally Fable compiled curried F# functions as nested JS anonymous functions (x => y => z) so we used Func<int,int,int> to indicate the function wasn't curried. In most cases the conversion from curried F# function to Func (aka delegate in .NET) was done automatically by the F# compiler but in others it was hindering usability, so from Fable 1.x on, we're trying not to compile curried functions as nested lambdas. And in most cases you don't need to use Func in signatures any more.
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