Trait redux_rs::Reducer

source · [−]

pub trait Reducer<State, Action> {
    fn reduce(&self, state: State, action: Action) -> State;
}

Expand description

Reducer trait

A reducer is responsible to calculate the next state based on the current state and an action. You can do this by implementing the Reducer or a function with the signature Fn(State, Action) -> State

Trait example

use redux_rs::Reducer;

enum Action {
    Increment,
    Decrement,
}

impl Reducer<u8, Action> for u8 {
    fn reduce(&self, state: u8, action: Action) -> u8 {
        match action {
            Action::Increment => state + 1,
            Action::Decrement => state - 1,
        }
    }
}

Fn example

use redux_rs::Reducer;

enum Action {
    Increment,
    Decrement,
}

fn reduce(state: u8, action: Action) -> u8 {
    match action {
        Action::Increment => state + 1,
        Action::Decrement => state - 1,
    }
}

Required methods

source

fn reduce(&self, state: State, action: Action) -> State

Method gets called every time a user dispatches an action to the store. This method takes the previous state and the action and is supposed to calculate the new state.

Implementors