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@k88/pipe-compose
Advanced tools
ES6-like pipe, compose, p-pipe, and p-compose in JavaScript, inspired by this Medium post.
This library exports 6 functions: pipe
, compose
, cPipe
, cCompose
, pPipe
, and pCompose
.
To paraphrase the Medium post, image you want to pipe the output of n-functions together. You'll end up with something like:
reverse(get3Chars(uppercase('the-argument')));
// EHT
In this example, you first uppercase
to get THE-ARGUMENT
, then you get3Chars
and have THE
and finally you reverse
it to get EHT
.
With pipe
you can accomplish the same thing using:
pipe('the-argument', uppercase, get3Chars, reverse);
It helps to read this similar to bash's pipe |
:
echo 'the-argument' | uppercase | get3Chars | reverse;
compose
is the reverse of pipe
. For example these two would return the same result.
pipe('the-argument', uppercase, get3Chars, reverse);
compose('the-argument', reverse, get3Chars, uppercase);
These are composable versions of pipe
and compose
, i.e.:
const textModifier = cPipe(uppercase, get3Chars, reverse);
textModifier('the-argument');
// EHT
textModifier('another-argument');
// ONA
There are also composable promise version of the pipe and compose.
const calc = pPipe(add1, multiply2, divide3);
await calc(2);
// 2
In this example, we are creating a calculation function that takes in an number, and performs basic math operation on it. In this case, we are passing 2
and first adding 1 to it (giving us 3), then multiplying by 2 (giving us 6) and finally dividing by 3 (giving us back 2).
As before, pCompose
would work in the reverse:
const calc = pCompose(add1, multiply2, divide3);
await calc(6);
// 5
Install from npm:
npm install @k88/pipe-compose
and use it:
import { pipe, compose } from '@k88/pipe-compose';
All of these auxiliary functions are one-liner, so you can also just copy/paste them into your application:
const pipe = (x, ...fns) => fns.reduce((v, f) => f(v), x);
const compose = (x, ...fns) => fns.reduceRight((v, f) => f(v), x);
const cPipe = (...fns) => (x) => => fns.reduce((v, f) => f(v), x);
const cCompose = (...fns) => (x) => fns.reduceRight((v, f) => f(v), x);
const pPipe = (...fns) => async (x) => fns.reduce(async (v, f) => f(await v), x);
const pCompose = (...fns) => async (x) => fns.reduceRight(async (v, f) => f(await v), x);
FAQs
ES6 pipe and compose in JavScript
The npm package @k88/pipe-compose receives a total of 10,407 weekly downloads. As such, @k88/pipe-compose popularity was classified as popular.
We found that @k88/pipe-compose demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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