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<?php
namespace Desmond\functions\core;
use Desmond\functions\DesmondFunction;
use Desmond\data_types\NumberType;
use Desmond\exceptions\ArgumentException;
class Subtract extends DesmondFunction
{
public function id()
return '-';
}
public function run(array $args)
$this->enforceTypes($args);
if (!isset($args[0])) {
return new NumberType(0);
$value = $args[0]->value();
array_shift($args);
if (empty($args)) {
return new NumberType($value - $value - $value);
foreach ($args as $number) {
$value -= $number->value();
return new NumberType($value);
private function enforceTypes($args)
foreach ($args as $arg) {
if (!($arg instanceof NumberType)) {
throw new ArgumentException('"-" expects arguments to be Numbers.');
Archer70 /
desmond
