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How can I find out the default value of a variable if it is not set? For example, the default timeout for the leader key is controlled by the timeoutlen variable, but if I do:
:echo timeoutlen
I get an "undefined variable" error. Is there any command to find out default values for variables like this?
For options, you can use the special syntax &optionname to echo its value. This is described in the help at :h expr-option
So you would want to do: :echo &timeoutlen
You could type :set {option}? to show the value of an option.
If you want to inspect where it was defined:
:verbose set timeoutlen?
timeoutlenis an option, not a variable. Read the help on options. Try:set timeoutlen?