So far Vimscript's variables may seem familiar if you come from a dynamic language like Python or Ruby. For the most part variables act like you would expect, but Vim adds a certain twist to variables: scoping.
Open two different files in separate splits, then go into one of them and run the following commands:
:let b:hello = "world" :echo b:hello
As expected, Vim displays "world". Now switch to the other buffer and run the
echo command again:
This time Vim throws an error, saying it can't find the variable.
When we used
b: in the variable name we told Vim that the variable
should be local to the current buffer.
Vim has many different scopes for variables, but we need to learn a little more about Vimscript before we can take advantage of the rest. For now, just remember that when you see a variable that start with a character and a colon that it's describing a scoped variable.
Skim over the list of scopes in
:help internal-variables. Don't worry if you
don't know what some of them mean, just take a look and keep them in the back of