~~~ function logger(store) { return function wrapDispatchToAddLogging(next) { return function dispatchAndLog(action) { console.log('dispatching', action) let result = next(action) console.log('next state', store.getState()) return result } } } ~~~ 現在是“我們該更進一步”的時刻了，所以可能會多花一點時間來讓它變的更為合理一些。這些串聯函數很嚇人。ES6 的箭頭函數可以使其 柯里化 ，從而看起來更舒服一些: ~~~ const logger = store => next => action => { console.log('dispatching', action) let result = next(action) console.log('next state', store.getState()) return result } ~~~