Pinq\Collection::offsetUnset PHP Method

    public function offsetUnset($index)
    {
        if ($this->source !== null) {
            $this->source->offsetUnset($index);
        } else {
            $this->toOrderedMap()->offsetUnset($index);
        }
    }

 public function offsetUnset($index)
 {
     if ($this->source !== null) {
         $this->source->offsetUnset($index);
     } else {
         $this->toOrderedMap()->offsetUnset($index);
     }
 }