Question

在Bluebird中是否有任何方便的解决方案链方法，其中每个元素的输入是前一个元素的解析值（除非它不是函数）？

我正在尝试将以下逻辑链接到一个方法中：

function getClient() {
    // resolves with the client
}

function getClientProduct(client) {
    // resolves with the product
}

var response = {}; // global response object;

function prepareResponse(product) {
    // prepares global response object, resolves with `undefined`
}

promise.someMethod(getClient, getClientProduct, prepareResponse, response)
    .then(data=> {
        // data = the response object;
    });

我想避免编写以下内容（如果可能）：

getClient()
    .then(client=>getClientProduct(client))
    .then(product=>prepareResponse(product))
    .then(()=>response);

Answer 1

那些箭头功能毫无意义。你可以做到

getClient().then(getClientProduct).then(prepareResponse).…

没有简便的方法可以进一步缩短 - 我想你不想考虑

[getClient, getClientProduct, prepareResponse].reduce((p,fn)=>p.then(fn), Promise.resolve())

对于最后一个，您可以使用.return(response) utility method。

Answer 2

你真的不需要一种方便的方法。你可以这样写：

function getClient() {
    // resolves with the client
}

function getClientProduct(client) {
    // resolves with the product
}

var response = {}; // global response object;

function prepareResponse(product) {
    // prepares global response object, resolves with `undefined`
}

getClient()
    .then(getClientProduct)
    .then(prepareResponse)
    .return(response);

用Bluebird链接结果

2 个答案: