使用 Bluebird 链接结果

Question

在 Bluebird 中是否有任何方便的方法用于解析链，其中每个元素的输入都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;
    });

我想避免必须编写以下内容（如果可能的话）：

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

Answer 1

那些箭头函数毫无意义。你可以简单地做

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

没有进一步缩短的便捷方法 - 我猜你不想考虑

[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

您真的不需要便捷方法。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);

使用 Bluebird 链接结果

Chaining results with Bluebird

javascript

bluebird