yuyat/compose

Function to compose functions

dev-master 2014-10-01 05:44 UTC

Requires

• php: >=5.6

Requires (Dev)

• phpunit/phpunit: ~4.2

MIT

• Yuya Takeyama

README

Function to compose functions.

Function-composition is commonly used technique in functional programming.
You can combine any callable's to build another function.

This library only supports PHP 5.6 later.
If you use the other version, igorw/compose is useful.

Usage

yuyat\compose

Calling compose($f, $g, $h) with an argument $x is equal to $f($g($h($x)))

<?php
use function yuyat\compose;

$splitAsWords = function ($str) {
    return \preg_split('/\s+/u', $str);
};
$camelizeWords = function ($words) {
    return \array_map('ucfirst', $words);
};
$join = function ($words) {
    return \join('', $words);
};
$lowerCamelize = compose('lcfirst', $join, $camelizeWords, $splitAsWords);

echo $lowerCamelize('foo bar baz'); // => "fooBarBaz"

yuyat\pipeline

This function also combines functions, but the arguments order is reversed.
Functions are applied in order of your reading.

Calling pipeline($f, $g, $h) with an argument $x is equal to $h($g($f($x)))

Author

Yuya Takeyama