/**
* Process filter
* @param callable $closure
* @return \Kohkimakimoto\EArray\EArray
*/
public function filter($closure)
{
if (!$closure instanceof \Closure) {
throw new \RuntimeException("The argument must be a closure");
}
$new = new EArray();
foreach ($this as $key => $value) {
if (call_user_func($closure, $key, $value)) {
$rawValue = $this->getRawValue($key);
$new->set($key, $rawValue);
}
}
return $new;
}
