Question

I’m confused about these in VIM. Some things need set and others let.
And, how can I check for a certain option. I know it’s an option because I use set to change it.

For example, how do I check if current filetype option is java?

Answer 1

:set is used for showing option values, setting option values explicitly and toggling them, while :let is used for setting option values as a result of some previous expression (when you define option value by a matter of a variable). Naturally, in vim scripting you’re gonna be using :let more.

For example:
you normally set filetype with

:set ft=batch

but you can also

:let varijabla='batch'
:let &filetype=varijabla