On 24/09/2016 04:26, Kay C Lan wrote:
On Fri, Sep 23, 2016 at 2:27 AM, Peter TB Brett
<peter.br...@livecode.com> wrote:
"" isn't "the absence of a string", it's a string that's 0 characters long.
Being able to use it as an array key is important for being able to
represent real-world data in an array.
It's an important point that "", a 0 character string is not the same
as NULL because we as humans often 'see them' as the same.
Very confusingly, "null" in LiveCode Script is _not_ the same as "NULL"
in SQL.
In LiveCode, "null" is shorthand for "numtochar(0)".
LiveCode Script doesn't really have the concept of "no value at all"
that is modelled by SQL's "NULL". Most of the syntax fakes it by using
the empty string, but unfortunately that doesn't work everywhere.
LiveCode Builder has "nothing", which is a proper "no value".
Peter
--
Dr Peter Brett <peter.br...@livecode.com>
LiveCode Technical Project Manager
lcb-mode for Emacs: https://github.com/peter-b/lcb-mode
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