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84 lines
2.3 KiB
Markdown
84 lines
2.3 KiB
Markdown
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[](https://travis-ci.org/stoeffel/compose-function)
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[](https://www.npmjs.com/package/compose-function)
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[](https://david-dm.org/stoeffel/compose-function)
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[](https://coveralls.io/github/stoeffel/compose-function)
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<h1 align="center">Compose-Function</h1>
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<p align="center">
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<a href="#installation">Installation</a> |
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<a href="#usage">Usage</a> |
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<a href="#related">Related</a> |
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<a href="#license">License</a>
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<br><br>
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<img align="center" height="300" src="http://33.media.tumblr.com/006dfad04f93ec5b3680ec7cdae3fafa/tumblr_n8kgl18uU41qcung4o1_1280.gif">
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<br>
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<sub>logo by <a href="http://justinmezzell.tumblr.com/">Justin Mezzell</a></sub>
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<blockquote align="center">Compose a new function from smaller functions `f(g(x))`</blockquote>
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</p>
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Installation
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------------
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`npm install compose-function`
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Usage
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-----
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## Basic usage
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```js
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import compose from 'compose-function';
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const composition = compose(sqr, add2); // sqr(add2(x))
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composition(2) // => 16
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compose(sqr, inc)(2); // => 9
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compose(inc, sqr)(2); // => 5
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```
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## with curry
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```js
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import compose from 'compose-function';
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import { curry, _ } from 'curry-this';
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const add = (x, y) => x + y;
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// add(6, sqr(add(2, x)))
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compose(
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add::curry(6),
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sqr,
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add::curry(2),
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);
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// map(filter(list, even), sqr)
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compose(
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map::curry(_, sqr),
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filter::curry(_, even),
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)([1,2,3,4,5,6,7,8]) // => [4, 16, 36, 64]
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```
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### `::` huh?
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If you’re wondering what the `::` thing means, you’d better read this excellent [overview](https://github.com/jussi-kalliokoski/trine/blob/5b735cbfb6b28ae94bac0446d9ecd5ce51fb149b/README.md#why) by [@jussi-kalliokoski](https://github.com/jussi-kalliokoski) or have a look at the [function bind syntax proposal](https://github.com/zenparsing/es-function-bind).
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Or checkout the [curry-this docs][ct].
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Related
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----
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* [curry-this][ct]
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License
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----
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MIT © [Christoph Hermann](http://stoeffel.github.io)
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[r]: http://ramdajs.com
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[ct]: https://github.com/stoeffel/curry-this
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