Set option or local variable {varname} in buffer {expr} to {val}. This also works for a global or local window option, but it doesn't work for a global or local window variable. For a local window option the global value is unchanged. For the use of {expr}, see |bufname()| above. Note that the variable name without "b:" must be used. Examples: :call setbufvar(1, "&mod", 1) :call setbufvar("todo", "myvar", "foobar") This function is not available in the |sandbox|. Can also be used as a |method|, the base is passed as the third argument: GetValue()->setbufvar(buf, varname)