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<?php
namespace DaveRoss\FunctionalProgrammingUtils;
/**
* Class Maybe
* @package DaveRoss\FunctionalProgrammingUtils
*/
class Maybe extends Monad
{
* Apply a function to this Monad's value only if the value is not null
*
* @param callable $f
* @return Maybe
public function map(callable $f)
return ( $this->isNothing() ) ? Maybe::of(null) : Maybe::of($f( $this->value ));
}
public function isNothing()
return ( null == $this->value );
* Helper function to apply a function to a Maybe that is not Maybe(null). Returns the value directly rather
* than wrapping it in another Maybe.
* @param mixed $x default value
* @param callable $f function to apply to a non-empty Maybe's value
* @param Maybe $m the Maybe to run the function against if the Maybe is not Maybe(null)
* @return mixed
function maybe($x, callable $f, Maybe $m)
return ( $m->isNothing() ) ? $x : $f( $m->value() );
daveross /
functional-programming-utils
