The way to do the first one in Finder is to start type d o c, as you might expect. Typing the same letter a second time in finder will go to the last file star

The way to do the first one in Finder is to start type d o c, as you might expect. Typing the same letter a second time in finder will go to the last file starting with that letter, which could be a handy feature. But d, down, down, down seems almost as good a d d d.