Ramda 中已弃用的 pipeP 的替代方案

Question

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

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

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.

Answer 1

Yes, this was deprecated in v0.26.0 .

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

pipeP (f1, f2, ..., fn) can be written as pipeWith (then) ([f1, f2, ..., fn]) .

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>