PHP code example of 8fold / php-foldable

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

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

    

8fold / php-foldable example snippets

class MyFoldable extends Fold
{
  public function append(string $string): MyFoldable
  {
    $this->main = $this->main . $string;

    return $this;

    // Note: If you prefer immutability, you can always create a new instance
    //       of the MyFoldable class:
    //
    //       return MyFoldable::fold(...$this->args(true));
  }
}

print MyFoldable::fold("Hello")->append(", World!")->unfold();
// output: Hello, World!

class Append extends Filter
{
  public function __invoke($using): string
  {
      if (is_a($using, Pipe::class)) {
          return $using->unfold() . $this->main;
      }
      return $using . $this->main;
  }
}

print Apply::append(", World!")->unfoldUsing("Hello");
// output: Hello, World!

class MyFoldable extends Fold
{
  public function append(string $string): MyFoldable
  {
    $this->main = Append::applyWith($string)->unfoldUsing($this->main);

    return $this;
  }
}

print MyFoldable::fold("Hello")->append(", World!")->unfold();
// output: Hello, World!

class Prepend extends Filter
{
  public function __invoke(string $using): string
  {
      return Append::applyWith($using)->unfoldUsing($this->main);
  }
}

$result = Pipe::fold("World",
  Apply::prepend("Hello, "),
  Apply::append("!")
)->unfold();
// output: Hello, World!

// you can allow filters to take pipes as well
$result = Pipe::fold("World",
  Apply::prepend(
    Pipe::fold("ello",
      Apply::prepend("H"),
      Apply::append(","),
      Apply::append(" ")
    )
  ),
  Apply::append("!")
)->unfold();

use PHPUnit\Framework\TestCase as PHPUnitTestCase;

use Eightfold\Foldable\Tests\PerformantEqualsTestFilter as AssertEquals;

class TestCase extends PHPUnitTestCase
{
  /**
  * @test
  */
  public function test_something()
  {
    AssertEquals::applyWith(
      "expected result",
      "expected type",
      0.4 // maximum milliseconds
    )->unfoldUsing(
      Pipe::fold("World",
        Apply::prepend(
          Pipe::fold("ello",
            Apply::prepend("H"),
            Apply::append(","),
            Apply::append(" ")
          )
        ),
        Apply::append("!")
      )
    );
  }
}

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