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<?php
namespace Desmond\functions\core;
use Desmond\functions\DesmondFunction;
use Desmond\ArgumentHelper;
use Desmond\data_types\ListType;
use Desmond\data_types\VectorType;
use Desmond\data_types\NumberType;
use Desmond\data_types\NilType;
use Desmond\exceptions\ArgumentException;
class Nth extends DesmondFunction
{
use ArgumentHelper;
public function id()
return 'nth';
}
public function run(array $args)
$this->expectArgs($args);
$list = $args[0]->value();
$index = $args[1]->value();
if (!array_key_exists($index, $list)) {
return new NilType();
return $list[$index];
private function expectArgs($args)
$this->expectArguments(
'nth',
[0 => ['List', 'Vector'], 1 => ['Number']],
$args
);
Archer70 /
desmond
