redux_rs/
reducer.rs

1/// # Reducer trait
2/// A reducer is responsible to calculate the next state based on the current state and an action.
3/// You can do this by implementing the `Reducer` or a function with the signature `Fn(State, Action) -> State`
4///
5/// ## Trait example
6/// ```
7/// use redux_rs::Reducer;
8///
9/// enum Action {
10///     Increment,
11///     Decrement,
12/// }
13///
14/// impl Reducer<u8, Action> for u8 {
15///     fn reduce(&self, state: u8, action: Action) -> u8 {
16///         match action {
17///             Action::Increment => state + 1,
18///             Action::Decrement => state - 1,
19///         }
20///     }
21/// }
22/// ```
23///
24/// ## Fn example
25/// ```
26/// use redux_rs::Reducer;
27///
28/// enum Action {
29///     Increment,
30///     Decrement,
31/// }
32///
33/// fn reduce(state: u8, action: Action) -> u8 {
34///     match action {
35///         Action::Increment => state + 1,
36///         Action::Decrement => state - 1,
37///     }
38/// }
39/// ```
40pub trait Reducer<State, Action> {
41    /// Method gets called every time a user dispatches an action to the store.
42    /// This method takes the previous state and the action and is supposed to calculate the new state.
43    fn reduce(&self, state: State, action: Action) -> State;
44}
45
46impl<F, State, Action> Reducer<State, Action> for F
47where
48    F: Fn(State, Action) -> State,
49{
50    fn reduce(&self, state: State, action: Action) -> State {
51        self(state, action)
52    }
53}
redux_rs/reducer.rs

redux_rs/
reducer.rs
