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Re^5: if variants

by DrHyde (Prior)
on Oct 22, 2004 at 09:22 UTC ( #401420=note: print w/ replies, xml ) Need Help??

in reply to Re^4: if variants
in thread if variants

In English, saying "if this, do that, else do the other" makes sense and is easy for a person to parse. However "unless this, do that, else do the other" is much harder to parse because the "else" clause is a double negative (or even a triple negative if you have "unless not this"). Same applies to perl.

While you could, perhaps, argue that "if not this, do that, else do the other" is also a double negative, it's still easy to parse because it's familiar. We see it in every programming language ever.

Comment on Re^5: if variants
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Re^6: if variants
by apotheon (Deacon) on Oct 23, 2004 at 09:34 UTC
    In short, then, it's a readability issue. Got it. Thanks.

    I think my facility for formal and symbolic logic systems probably makes it more difficult for me than for most people to recognize when some complex representation of a logical expression is difficult to parse by eye.

    - apotheon
    CopyWrite Chad Perrin

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