code: public function each(callable $callable)
      {
          foreach ($this->objects as $key => $value) {
              if (false === call_user_func_array($callable, array($value, $key))) {
                  break;
              }
          }
  
          return $this;
      }
docs: Execute the callback for each element
  
  @param callable $callable function ($value, $key) {}
  
  @return Collection