Messages

To help the computer understand what we want to tell it, we first translate user interactions into messages.

In Relm4, a message can be any data type, but most often, an enum is used.

enum AppMsg {
    Increment,
    Decrement,
}

Computers are capable of both sending and receiving messages and similarly, components in Relm4 can send and receive messages.

This is accomplished by having two types of messages: Input and Output.