[malingo]

Git checkout understands "hyphen expansion" for your previous branch (a la `cd -` to switch to your previous working directory), so switching between two branches is as easy as `git checkout -` or even `git co -` if you have an alias.

[iainmerrick]

But you’ll also have to rebuild. If your build system is bad, that could be slow. If your build system is really bad, you might need a clean build.

All build systems (that people actually use) are really bad.