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@blakek/compose
Advanced tools
🛠 Compose functions and promises
Code can become complex when several functions wrap others or reduce()
is used
to combine a list of funtions.
This allows composing a pipeline of functions. compose
calls each function
from right-to-left and passes the output from the previous to the next. pipe
is the same, but works from left-to-right.
Using Yarn:
$ yarn add @blakek/compose
…or using npm:
$ npm i --save @blakek/compose
import { compose, pipe } from '@blakek/compose';
const fetchUsers = () =>
Promise.resolve([
{ sites: { github: { username: 'blakek' } } },
{ sites: { github: { username: 'gsandf' } } },
{ sites: { github: { username: 'google' } } }
]);
// using `compose`
const getUsers = compose(
users => users.map(user => user.sites.github.username),
fetchUsers
);
// using `pipe`
const getUsersPipe = pipe(fetchUsers, users =>
users.map(user => user.sites.github.username)
);
getUsers().then(console.log); //» [ 'blakek', 'gsandf', 'google' ]
// NOTE: awaiting is only required if one of the arguments is a Promise
pipe(
n => n + 2,
n => n * 3
)(3); //» 15
await pipe(
() => delay(500),
n => n + 2,
n => n * 3
)(3); //» 15
compose
function compose(...[fn, ...fns]: Function[]): Function;
pipe
function pipe(...[fn, ...fns]: Function[]): Function;
Node.js and Yarn are required to work with this project.
To install all dependencies, run:
yarn
yarn build | Builds the project to ./dist |
yarn format | Format the source following the Prettier styles |
yarn test | Run project tests |
yarn test --watch | Run project tests, watching for file changes |
MIT
FAQs
🛠 Compose functions and promises
We found that @blakek/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.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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