comment on

Anyway, I still think unless is still much nicer than its slang equivalent, !if .

I have no problem with unless, but I cringe when I see it used as the block form. I find it interesting to note that perlsyn doesn't even bother mentioning it, so I'm surprised that it pops up so often.

It is mentioned in perlsyn (5.8.2), it's just easy to miss it:

from perlsyn(1):

       The following compound statements may be used to control flow:

           if (EXPR) BLOCK
           if (EXPR) BLOCK else BLOCK
           if (EXPR) BLOCK elsif (EXPR) BLOCK ... else BLOCK

...

       The "if" statement is straightforward.  Because BLOCKs are alwa
+ys bounded by curly
       brackets, there is never any ambiguity about which "if" an "els
+e" goes with.  If
       you use "unless" in place of "if", the sense of the test is rev
+ersed.
[download]

Btw, why isn't there an elsunless statement like if : unless = while : until = elsif : elsunless?

(Update: fixed /code tag)

In reply to Re^2: A new idiom -or- I Hate Unless by ambrus
in thread A new idiom -or- I Hate Unless by erikharrison

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.


Clear questions and runnable code get the best and fastest answer
	PerlMonks