Saw all the replies crying over how verbose these are, clicked through to TFA expecting to see simpler commands. Nope, they're basically the same thing, just slightly shorter. I would never memorize either the jj or git versions if I planned to use them regularly; I'd make aliases.
This is the only sane reply on this entire comment tree.
To me, the verbosity of both Git and JJ commands to do these things are an indication that neither of these tools are meant to do them.