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Example of how to do an Elm native module
Hi Gabriel! π
Thank you for putting this together: It helped me get started with Native modules in Elm 0.18! π€
NOTE: This is not really an issue, itβs more like an idea to add to the README, if it looks useful to you. π
So, in my case I needed a function thatβd take 2 arguments:
// src/Native/Intl.js
var _gurdiga$xo_elm$Native_Intl = function() {
function formatMoneyAmount(localeName, amount) {
return "yes";
}
return {
formatMoneyAmount: formatMoneyAmount
};
}();
and then I tried to call it like this:
Native.Intl.formatMoneyAmount "ro-MD" 42
It compiled, but when run in the browser (through elm-reactor
) it crashed the whole Elm app with something like this in the Chrome console:πΆ
Main.elm:93 Uncaught TypeError: fun(...) is not a function
at A2 (Main.elm:93)
at _gurdiga$xo_elm$Utils_Money$format (Main.elm:13254)
at _gurdiga$xo_elm$Dosar_Actiune_IncheiereIntentare_RezultatIncercareConciliere_PartileNuAjungLaIntelegere_BunuriUrmarite_BunUrmarit$view (Main.elm:15783)
at itemView (Main.elm:15967)
at Function.func (Main.elm:1390)
at A2 (Main.elm:92)
at Function.foldr [as func] (Main.elm:1116)
at A3 (Main.elm:98)
at Function.func (Main.elm:1384)
at A2 (Main.elm:92)
Then I went on to look how itβs done in the elm-lang/core
and found this in Native/Debug.js
:
return {
crash: crash,
log: F2(log) // β See the F2 thingy?
};
Then I looked in my bundle and found F2
:
function F2(fun)
{
function wrapper(a) { return function(b) { return fun(a,b); }; }
wrapper.arity = 2;
wrapper.func = fun;
return wrapper;
}
So my guess after all of this, is that if a native function that we want to use in Elm takes more than one argument, it has to be wrapped into an F<number>
thing like that β it seems like further on Elm decides how many arguments to pass it. π€ (I found F1
to F9
in my bundle. π€)
Iβm not sure where would this insight go in the README, but I thought this may be useful for someone! π€
Cheers! π
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