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enum LoggerLevel {
    VERBOSE = 0,
    DEBUG = 1,
    INFO = 2,
    WARN = 3,
    ERROR = 4
}

enum ConsoleMethod {
    log = 'log',

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// Tiny Redux

export const combineReducers = reducers => {
  return (state = {}, action) => {
    return Object.keys(reducers).reduce(
      (nextState, key) => {
        nextState[key] = reducers[key](state[key], action)
        return nextState
      },
      {} 

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// 寄生组合继承 (相对完美的继承范式)

// 父类
function Animal (name) {
  // 实例方法
  this.name = name
  
  this.sleep = function () {
    console.log(`${this.name} is sleeping...`)
  }