>>>>> "PRL" == Perl6 RFC Librarian <[EMAIL PROTECTED]> writes:
PRL> In perl5, index() and rindex() return -1 if the
PRL> substring isn't found. This seems out of step with
PRL> the rest of Perl's functions, which return C<undef>
PRL> on error. I propose changing index() and rindex()
PRL> to return C<undef> if the substring isn't found.
PRL> This would also cause warnings to be issued when
PRL> programmers use the results of index() or rindex()
PRL> assuming the substring was found.
Removing -1 as a valid result, could be a breakage (if someone is
doing something weird with a negative result)
Would it be reasonable to ask that passing undef into the offset
or start of substr have substr return an undef?
This would break the undef == 0 under normal circumstance, but
it would prevent an error from propogating.
$foo = "flabergasted";
substr($foo, index($foo, 'abc'), 20); # Returns undef
If this is too much breakage what about only if it is the argument?
$foo = "flabergasted";
$x = index($foo, 'abc');
substr($foo, $x, 20); # starts from the end
<chaim>
--
Chaim Frenkel Nonlinear Knowledge, Inc.
[EMAIL PROTECTED] +1-718-236-0183
