了解嵌套箭头函数ES6 [英] Understanding nested arrow functions ES6

问题描述

const logger = store => next => action => {
    let result
    console.groupCollapsed("dispatching", action.type)
    console.log('prev state', store.getState())
    console.log('action', action)
    result = next(action)
    console.log('next state', store.getState())
    console.groupEnd()
    return result
}

const store = applyMiddleware(logger)(createStore)(
    combineReducers({ colors, sort })
)

请用多个箭头解释上述函数吗？

Would you please explain the above function with multiple arrows?

推荐答案

以下代码：

const logger = store => next => action => { return 'something'; }

相当于：

const logger = function(store) { 
    return function(next) {
        return function(action) {
            return 'something';
        }
    }
}

它可以像下面：

var something = logger(store)(next)(action);

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