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Compiler Reminders

Published on: 2025-08-07 04:40:31

Even though it is rarely called that way, compiler reminders are a very useful feature in Elm, one that is core to making Elm code maintainable. The idea is that whenever a change in the code would lead to other code needing to be modified at the same time, we'd get a compiler error reminding us that we need to make some kind of change. We like this so much in Elm that a common task for beginners is to take the basic Elm counter example and add a button to reset the counter to 0. This usually goes well (depending on how much the different syntax bothers them) because the compiler will tell them what the next step is. (I'll go through it so if you want to do it yourself, pause now and have a go at it) We add a button: button [ onClick Reset ] [ text "Reset" ] somewhere in the view . -- NAMING ERROR --------------------------------------------------- src/Main.elm I cannot find a `Reset` variant: 38| , button [ onClick Reset ] [ text "Reset" ] ^^^^^ We get a compiler error saying that ... Read full article.