Here is an example where callbacks are even less intuitive: if not song.artist @getArtist song.id, (err, artist) => song.artist = artist @sav

Here is an example where callbacks are even less intuitive: if not song.artist @getArtist song.id, (err, artist) => song.artist = artist @save song @addToCatalog song #... else @save song @addToCatalog song #... Callbacks will force you to move @save, @addCatalog, ... into a separate function. Completely messing up the logical sequence of operations.