PHP code example of crell / fp

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

crell / fp example snippets

use function Crell\fp\pipe;

$result = pipe(5,
  static fn ($in) => $in ** 4,     // Returns 625
  static fn ($in) => $in / 4,     // Returns 156.25
  static fn ($in) => (string)$in,  // Coerces the number to a string
  strlen(...),                    // Returns the length of the string
);
// $result is now 6, because "156.25" has 6 characters in it.

use function Crell\fp\explode;

$result = pipe("Hello world",
  explode(' '),  // Produces ['Hello', 'world']
  count(...),    // Returns tne number of array elements, which is 2
);
// $result is now 2

// or

$words = explode(' ')("Hello World");
// $words is now ['Hello', 'world']

use Crell\fp\Evolvable;

readonly class Person
{
    use Evolvable;

    public function __construct(
        public string $name,
        public int $age,
        public string $jobTitle,
    ) {}
}

$p = new Person("Larry");
$p2 = $p->with(age: 18, jobTitle: "Developer");

use Crell\fp\Newable;

readonly class Person
{
    use Newable;

    public function __construct(
        public string $name,
        public int $age,
        public string $jobTitle,
    ) {}
}

$p = Person::new("Larry", 18, "Developer");

$result = pipe($inputFile,
    file_get_contents(...),
    trim(...),
    explode(PHP_EOL),
    pairUp(...),
    afilter(static fn($v): bool => $v[0] > $v[1]),
    count(...),
);

function lines(string $file): iterable
{
    $fp = fopen($file, 'rb');

    while ($line = fgets($fp)) {
        yield trim($line);
    }

    fclose($fp);
}

function parse(string $line): Step
{
    [$cmd, $size] = \explode(' ', $line);
    return new Step(cmd: Command::from($cmd), size: (int)$size);
}

$end = pipe($inputFile,
    lines(...),
    itmap(parse(...)),
    reduce(new Position(0, 0), move(...)),
);

$end = pipe($inputFile,
    lines(...),
    amap(parse(...)),
    reduce(new Position(0, 0), move(...)),
);