On Wed, 6 Oct 2010, ZyX wrote:
Ответ на сообщение <<Re: Adding items'List to items'List2>>, присланное
в 23:18:25 06 октября 2010, Среда. Отправитель: Benjamin R. Haskell:
Why you are using `strlen()'? Vim neither stores string length
alongside with string nor recognizes when `strlen' is used in boolean
context, so using `empty()' or `()==#""' is better as it does not
require to loop over the entire string for a null byte.
"Why"? = unaware that Vimscript, unlike many langs, doesn't store the
string length. Also didn't realize that strings can't have null bytes
(which is often what the strlen() optimization allows for in the first
place):
:echo strlen("foo\x00bar")
3
:echo strlen("foo".nr2char(0)."bar")
3
(( explained right above ':help literal-string' ("Note that "\000" and
"\x00" force the end of the string"), and in ':help nr2char()' ))
I guess it's only surprising because I thought the whole point of the
odd \r/\n behavior in s/// was to support null bytes, and didn't realize
it was only for buffers (not for strings).
Upshot: 'empty(v:val)' or 'v:val == ""' is better. (Any particular
reason to use '==#', seeing as how the case of "" doesn't matter?)
--
Best,
Ben
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