Redux implementation

gistfile1.txt

const createStore = (reducer) =>
{
    let state;
    let listeners = [];

    const getState = () => state;

    const dispatch = (action) =>
    {
        state = reducer(state , action);
        listeners.forEach((cb) => cb());
    };

    const subscribe = (listener) =>
    {
        listeners.push(listener);
        return () => {
            listeners = listeners.filter(cb => cb !== listener);
            return listeners;
        }
    }

    dispatch({})

    return {getState , dispatch , subscribe};
}

let store = createStore(counter);

store.dispatch('INCREMENT');
store.subscribe(() =>
{
    console.log("Callback1");
});


store.subscribe(() =>
{
    console.log("Callback2");
})