Ramda 中已弃用的 pipeP 的替代方案 [英] Alternative to deprecated pipeP in Ramda

问题描述

我目前使用 Ramda 的 pipeP 实现了类似的实现:

I currently have something like this implementation using Ramda's pipeP:

const fetchAmount = () => new Promise((resolve) => setTimeout(() => resolve({value: 5}, 1000)))

const getTotal = pipeP(
  fetchAmount,
  prop('value'),
  add(2)
)

await getTotal() //=> 7

而且我已经看到它已被弃用，我找到的唯一解决方案是添加 then，例如:

And I've seen that it's deprecated and the only solution I found is adding then, like:

const fetchAmount = () => new Promise((resolve) => setTimeout(() => resolve({value: 5}, 1000)))

const getTotal = pipeP(
  fetchAmount,
  then(prop('value')),
  then(add(2))
)

await getTotal() //=> 7

这是要走的路吗?我想弃用 pipeP 可能有一些重要的原因，因为将 Promise 与纯函数结合使用时它真的很容易使用.

Is this the way to go? I guess there might be important reasons to deprecate pipeP because it was really easy to use when combining promises with pure functions.

推荐答案

是的，这在 中已被弃用v0.26.0.

Ramda 添加了 pipeWith 和 composeWith，涵盖了更广泛的范围.

Ramda added pipeWith and composeWith, which covered a wider spectrum.

pipeP (f1, f2, ..., fn) 可以写成 pipeWith (then) ([f1, f2, ..., fn]).

如果你想要完全相同的签名，你可以这样写:

If you want the exact same signature, you can write something like this:

const pipePromises = unapply (pipeWith (then))

pipePromises (
  (n) => Promise .resolve (n + 1),
  (n) => Promise .resolve (n * n),
  (n) => Promise .resolve (n - 3)
) 
(4) 
.then (console .log)  //~> 22

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>
<script>const {unapply, pipeWith, then} = R              </script>

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