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Add tap for Option and Result

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This commit is contained in:
Daniel J. Summers 2024-07-27 13:03:54 -04:00
parent 193147cfb3
commit 7837f4af17
4 changed files with 72 additions and 0 deletions
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13
src/Option.php
View File

@ -202,4 +202,17 @@ readonly class Option
{
return self::isSome($it) ? $it->get() : null;
}
/**
* Tap into the `Result` for a secondary action, returning the result
*
* @param callable(Option<T>): mixed $f The function to run (return value is ignored)
* @param Option<T> $it The option against which the function should be run
* @return Option<T> The same option provided
*/
public static function tap(callable $f, Option $it): Option
{
$f($it);
return $it;
}
}

13
src/Result.php
View File

@ -165,4 +165,17 @@ readonly class Result
{
return Result::isOK($it) ? Option::Some($it->getOK()) : Option::None();
}
/**
* Tap into the `Result` for a secondary action, returning the result
*
* @param callable(Result<TOK, TError>): mixed $f The function to run (return value is ignored)
* @param Result<TOK, TError> $it The result against which the function should be run
* @return Result<TOK, TError> The same result provided
*/
public static function tap(callable $f, Result $it): Result
{
$f($it);
return $it;
}
}

22
tests/OptionTest.php
View File

@ -237,4 +237,26 @@ class OptionTest extends TestCase
{
$this->assertEquals('boy howdy', Option::unwrap(Option::Some('boy howdy')), '"Some" should return its value');
}
#[TestDox('Tap succeeds with Some')]
public function testTapSucceedsWithSome(): void
{
$value = '';
$original = Option::Some('testing');
$tapped = Option::tap(
function (Option $it) use (&$value) { $value = Option::isSome($it) ? $it->get() : 'none'; }, $original);
$this->assertEquals('testing', $value, 'The tapped function was not called');
$this->assertSame($original, $tapped, 'The same option should have been returned');
}
#[TestDox('Tap succeeds with None')]
public function testTapSucceedsWithNone(): void
{
$value = '';
$original = Option::None();
$tapped = Option::tap(
function (Option $it) use (&$value) { $value = Option::isSome($it) ? $it->get() : 'none'; }, $original);
$this->assertEquals('none', $value, 'The tapped function was not called');
$this->assertSame($original, $tapped, 'The same option should have been returned');
}
}

24
tests/ResultTest.php
View File

@ -197,4 +197,28 @@ class ResultTest extends TestCase
$value = Result::toOption(Result::Error('file not found'));
$this->assertTrue(Option::isNone($value), 'An "Error" result should map to a "None" option');
}
#[TestDox('Tap succeeds for OK result')]
public function testTapSucceedsForOKResult(): void
{
$value = '';
$original = Result::OK('working');
$tapped = Result::tap(function (Result $it) use (&$value) {
$value = Result::isOK($it) ? 'OK: ' . $it->getOK() : 'Error: ' . $it->getError();
}, $original);
$this->assertEquals('OK: working', $value, 'The tapped function was not called');
$this->assertSame($original, $tapped, 'The same result should have been returned');
}
#[TestDox('Tap succeeds for Error result')]
public function testTapSucceedsForErrorResult(): void
{
$value = '';
$original = Result::Error('failed');
$tapped = Result::tap(function (Result $it) use (&$value) {
$value = Result::isOK($it) ? 'OK: ' . $it->getOK() : 'Error: ' . $it->getError();
}, $original);
$this->assertEquals('Error: failed', $value, 'The tapped function was not called');
$this->assertSame($original, $tapped, 'The same result should have been returned');
}
}