How to copy the current value of a `set` option into the clipboard?

Question

I sometimes need to copy the current value of a set option, e.g. set statusline, into the clipboard (+) to paste its value here.

I know how to show the current value of a set option, e.g. set statusline?, but how can I copy that value to the clipboard (+)?

Answer 1

Just like this

let @+ = &statusline

Or like this

call setreg("+", getbufvar("%", "&statusline"))

Or even like this...

if has("nvim")
  call provider#clipboard#Call("set", [[matchstr(execute("set statusline"), "=\@=.*"], "v", "+"])
endif