vim: gU and gu in one map

Question

in vim, with

gUw

make the word uppercase, with

guw

make the word lowercase.
how I can convert in one map the upper to lower and the lower to upper?

Answer 1

If you're trying to invert case, you can use ~. Normally this works only on the selection (e.g. visual mode), but if you want it to be more useful, then :set tildeop so you can do ~w or whatever movement command you like.

Answer 2

You can use the tilde operator with global commands too: g~w

The advantage being, that you can then use the . operator to repeat the operation :)