Redux-like library in 13 lines

mini-redux.js

const createStore = (reducer, state) => {
    let subscribers = [];
    return {
        dispatch: (action) => {
            state = reducer(state, action);
            subscribers.forEach(f => f(state));
        },
        getState: () => state,
        subscribe: (f) => {
            subscribers.push(f);
        }
    }
};