Hi, Quick comment on item 2.3: SHOULD NOT update a var using loops or conditions. you conclude that this expression is the best option: val sum = elements.map

Hi, Quick comment on item 2.3: SHOULD NOT update a var using loops or conditions. you conclude that this expression is the best option: val sum = elements.map(_.value).sum This expression is not equivalent to the previous options in performance and memory, as the map expression will create a entire new sequence. For large sequences, a better option is to write: val sum = elements.view.map(_.value).sum