> > You might look at lenses (e.g. elm-monocle) to see one approach that might > appeal to you.
This is pretty cool. I've often made setter functions for my records, wrapping around Elm's regular update syntax. I didn't realize that it's part of a larger class of patterns. On Tue, Nov 22, 2016 at 7:13 AM, Austin Bingham <[email protected]> wrote: > You might look at lenses (e.g. elm-monocle) to see one approach that might > appeal to you. Lenses are apparently frowned upon by some, but I think they > capture the essence of what you're asking. > > On Tue, Nov 22, 2016 at 4:04 PM Wouter In t Velt <[email protected]> > wrote: > >> Op dinsdag 22 november 2016 15:55:25 UTC+1 schreef Rex van der Spuy: >> >> But, can anyone explain why Elm doesn't let us do this? >> >> >> My impression is that it has to do with the enforced strong typing and >> type safety of elm. >> >> A record is intended for key-value type info where each value could be of >> a different type. >> And elm's greatness requires that elm always knows the type it is working >> on. >> Dynamic typing for records (which javascript does allow for objects) >> would break this guarantee. >> >> So with a record, you get the flexibility that each field could be >> whatever type, but you lose the dynamicness (is that even a word?) of the >> keys. >> With Dict, it is the other way around. You can get a value by supplying a >> dynamic key, but all values in the Dict must be of the same type. >> >> -- >> 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. >> > -- > 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. > -- 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.
