original_string: public function offsetExists($offset): bool
      {
          MDataType::mustBe(array(MDataType::INT));
  
          return (array_key_exists($offset, $this->list) === true);
      }
code: public function offsetExists($offset): bool
      {
          MDataType::mustBe(array(MDataType::INT));
  
          return (array_key_exists($offset, $this->list) === true);
      }
code_tokens: public function offsetExists ( $ offset ) : bool { MDataType :: mustBe ( array ( MDataType :: INT ) ) ; return ( array_key_exists ( $ offset , $ this -> list ) === true ) ; }
docstring: Return if a key exists.
  
  @param int $offset
  @return bool
docstring_tokens: Return if a key exists .