elm-update-builder | Compose a complex update function from primitive functions

elm-update-builder is a Elm library. elm-update-builder has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Say we have a form to register personal information for goats. Let's define the model:. As you can see from the model definition, this form has input fields for name and coat color. Each of the input fields is required, and we want to display an error if the field is blank. But what about the moment when the user opens the form? Inputs for the name and coat color are blank, which means that if we validate the form as it is, the user will see an error. It's not user friendly to tell "you're wrong" when user just opens a form. It is the reason why we have showError in the model. The showError is a flag that says, "Show errors on the screen". The value is False by default not to show errors on loading the app, and changed to be True on pressing the submit button. The other flag isBusy represents whether the message is being sent or not. It prevents the various glitches caused by short-tempered goats who hit the send button repeatedly with their two hoofs.