Datashaman\Logic\D Example

Datashaman\Logic\D Example

<?php
<<<CONFIG
packages:
- "datashaman/logic: dev-master"
CONFIG;
#
# This is a Melody script. http://melody.sensiolabs.org/
#

use function Datashaman\Logic\D;
use function Datashaman\Logic\mkMaybe;

$f = D(0);
echo $f(mkMaybe(null)) . PHP_EOL;
echo $f(mkMaybe(12)) . PHP_EOL;

$f = D(0, function ($value) {
    return $value * 2;
});
echo $f(mkMaybe(null)) . PHP_EOL;
echo $f(mkMaybe(12)) . PHP_EOL;