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Re: methods for dealing with zero '0' as a string or char

by Laurent_R (Canon)
on Aug 02, 2019 at 14:18 UTC ( #11103768=note: print w/replies, xml ) Need Help??


in reply to methods for dealing with zero '0' as a string or char

Depending on your use case, Perl has a special string, '0 but true', which is evaluated to 0 in numeric context, but as true in Boolean context. This is sometimes useful for returning a zero but true value from a function to the caller. See for example https://riptutorial.com/perl/topic/649/true-and-false. The only thing special about that string is that it will issue no warning in numeric context; otherwise it is true, as any string other than the string containing only 0 ('0') and the empty string (''). Another possibility in the same context is to return a string such as '0e0'.

Another possibility is sometimes to return a reference to the variable containing the "0" string.

Replies are listed 'Best First'.
Re^2: methods for dealing with zero '0' as a string or char
by boleary (Beadle) on Aug 21, 2019 at 12:36 UTC

    Thanks, I like this trick

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