complete Redux with Ramda

ramdaReduxReact.js

const counterReducer = (state = 0, {type}) => {
  switch(type) {
    case 'INC': return state + 1
    case 'DEC': return state - 1
    default: return state
  }
}

const todoReducer = (state = 0, {type, text}) => {
  switch(type) {
    case 'ADD_TODO': return [...state, {text, completed: false }]
    default: return state
  }
}

const redux = (reducers, state) => {
  const listeners = []
  const reducingFns =
        R.mapObjIndexed((reducer, key) => R.useWith(reducer, [R.prop(key), R.identity]))
  const update =  R.converge(R.applySpec, [reducingFns])
  const updateState = update(reducers)
  
  return {
    dispatch: (action) => {
      state = updateState(state, action)
      R.forEach(f => f(state), listeners)
    },
    subscribe: (f) => {
      listeners.push(f)
    }
  }
}

const store = redux({
  counter: counterReducer,
  todos: todoReducer,
}, {counter: 0, todos: []}) 

store.subscribe(state => console.log('LOG:', JSON.stringify(state, null, 4)))
                     
store.dispatch({type: 'INC'})

store.dispatch({type: 'INC'})

store.dispatch({type: 'INC'})

store.dispatch({type: 'INC'})