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<?php
namespace DaveRoss\FunctionalProgrammingUtils;
/**
* Class Either
* Base class for an Either Monad
* @package DaveRoss\FunctionalProgrammingUtils
*/
abstract class Either extends Monad
{
}
* Helper function to apply one of a pair of function to Either a Left or Right . Returns the value directly rather
* than wrapping it in another Either.
*
* @param callable $f function to apply if $e is a Left
* @param callable $g function to apply if $e is a Right
* @param Either $e
* @return mixed
function either(callable $f, callable $g, Either $e)
switch (get_class($e)) {
case 'DaveRoss\FunctionalProgrammingUtils\Left':
return $f( $e->value() );
case 'DaveRoss\FunctionalProgrammingUtils\Right':
return $g( $e->value() );
daveross /
functional-programming-utils
