elm

Very new to Elm but wanted to play around with the <~ operator. It seems when I run elm-make, <~ it is not recognized as an operator, and I get the error Cannot find variable <~ Has this been deprecated ( I see it in the docs at elm-lang.org/docs/syntax#mapping ). Am I just using it incorrectly? Here is my code snippet that will not compile- sqrtSig : Signal number sqrtSig = sqrt <~ Mouse.x Yes, <~ and ~ were removed following this discussion 来源： https://stackoverflow.com/questions/33817365/in-elm-0-16-0-gives-me-a-compile-time-error

I'm currently writing an online game where I use Haskell for the server-side backend and Elm for the frontend/rendering. Right now I have my GameState as one big ADT, in a type simple enough that I can use it in Elm as well. I was hoping to avoid using JSON, and simply pass Elm the output of "show" on the data, which I could then parse-back into an ADT in Elm. I'm wondering, is there anything equivalent to haskell's "read" which can automatically look at a string output by show, and parse it back into data? If not, are there any existing parser-libraries available for Elm? If I do end up going

Okay, what I really wanted to do is, I have an Array and I want to choose a random element from it. The obvious thing to do is get an integer from a random number generator between 0 and the length minus 1, which I have working already, and then applying Array.get , but that returns a Maybe a . (It appears there's also a package function that does the same thing .) Coming from Haskell, I get the type significance that it's protecting me from the case where my index was out of range, but I have control over the index and don't expect that to happen, so I'd just like to assume I got a Just

I want to load user profile before rendering something into the page but the whole user profile is composed of different parts that are loaded by multiple HTTP requests. So far I'm loading user profile in sequence (one by one) type alias CompanyInfo = { name: String , address: ... , phone: String , ... } type alias UserProfile = { userName: String , companyInfo: CompanyInfo , ... } Cmd.batch [ loadUserName userId LoadUserNameFail LoadUserNameSuccess , loadCompanyInfo userId LoadCompanyInfoFail LoadCompanyInfoSuccess ... ] But that's not very effective. Is there a simple way how to perform a

I would like to integrate Elm with a Javascript library in such a way that Elm would dynamically create "cells" (html divs), and Javascript would be provided with their id-s and use them to perform custom operations. The sequence I want to have is Elm creates a cell (and assigns id) Message with id is sent to port Javascript receives message and performs its action This is how I implemented this at the beginning ( full source ): port onCellAdded : CellID -> Cmd msg update : Msg -> Model -> (Model, Cmd Msg) update message ({cells} as model) = case message of Push -> let uid = List.length cells

I want to generate a random int between two values in elm. Something like this: nb = random(0, 10) I have read the doc and multiple post. The best answer was from this stackoverflow post gen = Random.int 0 10 seed0 = Random.initialSeed 123456 Random.generate gen seed0 But the issue is it's always return the same value and it's not even an int it's something like this: (7,Seed { state = State 645041272 40692, next = <function>, split = <function>, range = <function> }) : ( Int, Random.Seed ) So from the doc , it's better to use the current time for the seed. But how do I get it? Do I have to

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