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76 lines
2.1 KiB
76 lines
2.1 KiB
4 years ago
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# cumpa
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Minimal function composition implementation
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<img alt="cumpa" src="./cumpa.gif" width="50%"/>
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> `cumpá` in some Italian :it: dialects means `fellow`
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[![Build Status][travis-image]][travis-url]
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[![NPM version][npm-version-image]][npm-url]
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[![NPM downloads][npm-downloads-image]][npm-url]
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[![MIT License][license-image]][license-url]
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## Usage
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```js
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import compose from 'cumpa'
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const add2 = x => x + 2
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const multiplyBy3 = x => x * 3
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const add2AndMultiplyBy3 = compose(multiplyBy3, add2)
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console.log(add2AndMultiplyBy3(1)) // ((1 + 2) * 3) = 9
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```
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[travis-image]: https://img.shields.io/travis/GianlucaGuarini/cumpa.svg?style=flat-square
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[travis-url]: https://travis-ci.org/GianlucaGuarini/cumpa
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[license-image]: http://img.shields.io/badge/license-MIT-000000.svg?style=flat-square
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[license-url]: LICENSE
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[npm-version-image]: http://img.shields.io/npm/v/cumpa.svg?style=flat-square
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[npm-downloads-image]: http://img.shields.io/npm/dm/cumpa.svg?style=flat-square
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[npm-url]: https://npmjs.org/package/cumpa
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## API
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<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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#### Table of Contents
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- [composeRight](#composeright)
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- [Parameters](#parameters)
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- [compose](#compose)
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- [Parameters](#parameters-1)
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### composeRight
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Similar to compose but performs from left-to-right function composition.<br/>
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[see also](https://30secondsofcode.org/function#composeright)
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#### Parameters
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- `fns` **...\[[function](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function)]** ) - list of unary fynctions
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Returns **any** result of the computation
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### compose
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Performs right-to-left function composition.
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Use Array.prototype.reduce() to perform right-to-left function composition.
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The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.<br/>
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[source code](https://30secondsofcode.org/function#compose)
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#### Parameters
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- `fns` **...\[[function](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function)]** ) - list of unary fynctions
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Returns **any** result of the computation
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