Skip to content
Function composition
JavaScript
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
module
test
.babelrc
.coveralls.yml
.editorconfig
.gitignore
.jshintrc
.travis.yml
LICENSE.md
README.md
package.json
test.js

README.md

Travis npm Dependency Status Coveralls

Compose-Function

Installation | Usage | Related | License


logo by Justin Mezzell

Compose a new function from smaller functions `f(g(x))`

Installation

npm install compose-function --save

Usage

Basic usage

import compose from 'compose-function';

const composition = compose(sqr, add2); // sqr(add2(x))

composition(2) // => 16

compose(sqr, inc)(2); // => 9
compose(inc, sqr)(2); // => 5

with curry

import compose from 'compose-function';
import { curry, _ } from 'curry-this';


const add = (x, y) => x + y;

// add(6, sqr(add(2, x)))
compose(
  add::curry(6),
  sqr,
  add::curry(2),
);

// map(filter(list, even), sqr)
compose(
  map::curry(_, sqr),
  filter::curry(_, even),
)([1,2,3,4,5,6,7,8]) // => [4, 16, 36, 64]

:: huh?

If you’re wondering what the :: thing means, you’d better read this excellent overview by @jussi-kalliokoski or have a look at the function bind syntax proposal. Or checkout the curry-this docs.

Related

License

MIT © Christoph Hermann

You can’t perform that action at this time.