yuyat/curry

Function does currying

v0.9.0 2014-10-13 14:29 UTC

Requires

• php: >=5.3
• yuyat/callable_to_reflector: ~0.9.0

Requires (Dev)

• phpunit/phpunit: ~4.2

MIT

• Yuya Takeyama

README

Function does currying.

Virtually, it transforms functions takes multiple arguments into nested function each takes one argument like below.

f(x, y, z) => f(x)(y)(z)

And it can be applicated partially. All of below means same.

f(x)(y)(z)
f(x)(y, z)
f(x, y)(z)
f(x, y, z)

Usage

Basic usage

<?php
use function yuyat\curry;

$sum = curry(function ($x, $y, $z) {
    reteurn $x + $y + $z;
});

echo $sum(1)->apply(2)->apply(3), PHP_EOL;
// => 6

echo $sum[1][2][3], PHP_EOL; // Ruby-like short syntax
// => 6

Currying functions take variadic parameters

For functions take variadic parameters, you must specify actual parameter length as 2nd argument.

<?php
use function yuyat\curry;

$sum = curry(function (/* numbers to calculate sum */) {
    $result = 0;

    foreach (func_get_args() as $arg) {
        $result += $arg;
    }

    return $result;
}, 3);

echo $sum(1)->apply(2)->apply(3), PHP_EOL;
// => 6

Author

Yuya Takeyama