Thank. This makes lots of sense in regards of first argument. What about the second? In 0.17 it could be for example:
(Http.get "my.json" decoderFunction) But not it produced an error: Function `attempt` is expecting the 2nd argument to be: Task.Task > Http.Error (Maybe MyType) But it is: Http.Request MyType On Wednesday, November 16, 2016 at 2:22:48 PM UTC+1, Peter Damoc wrote: > > The old Task.perform was creating either a success message (if it > succeeded) or a fail message (if it failed) > The current Task.perform cannot fail. It is used for Tasks that are known > to succeed like requesting the window size or requesting some random > number. > > The Task.attempt takes a function that takes a result (results encapsulate > both the success and the failure) and produces a message based on that > result. > > You could define something like: > > handleRequest result = > case result of > Ok val -> > SuccessMessage val > Err err -> > FailMessage err > > and use it like this: > > someHttpCmd = Task.attempt handleRequest someHttpRequestTask > > Alternatively, you could just have only one message that takes a Result > and handle each case in that message's part of the update as demonstrated > by the Http example: > http://elm-lang.org/examples/http > > > > > On Wed, Nov 16, 2016 at 3:05 PM, Tim Bezhashvyly <[email protected] > <javascript:>> wrote: > >> Sorry again if something obvious but Im not sure how now to make async >> requests in 0.18.0. >> >> In 0.17.1 it was done with Task.perform where first parameter was a >> success Msg, second - fail Msg and third is the task which execution result >> is then passed to first function. >> >> As far as I understand now Task.attempt must be used but documentation is >> not quite comprehensive. Could someone please advise? >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Elm Discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > There is NO FATE, we are the creators. > blog: http://damoc.ro/ > -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
