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My question might be silly since I'm a new vimscript user.
I need to define a variable as follows:
let foo = 1
"Implementing foo
:echo foo
Without success, I tried to increment my variable with the following syntaxes:
foo = foo + 1
++foo
foo++
foo+=1
I might miss something quite obvious, but I can't figure what.
I know about the <C-a> shortcut but I'm searching for a syntactical way of doing things.
In vim script, everything has to be an ex (:) command. Thus, the way vim distinguishes a command named foo and changes to the variable foo is the let command:
let foo += 1
This is not so in vim9script, where
foo += 1
works fine, and so does ++foo (but not (yet) in an expression).
:letcommand, so either:let foo = foo + 1or:let foo += 1will work. You don't need the:if you're in a vimscript, only when typing commands from inside Vim itself.<C-a>key binding is a Normal mode command, so it's not really related to Vim variables. It acts on the buffer contents instead.