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POIs there some way to make variables like $a and $b in regard to strict?
 

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  1. POIs there some way to make variables like $a and $b in regard to strict?
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    <p>In light of Michael Carman's comment, I have decided to rewrite the question. Note that 11 comments appear before this edit, and give credence to Michael's observation that I did not write the question in a way that made it clear what I was asking. <hr/> <em>Question:</em> What is the standard--or <em>cleanest</em> way--to fake the special status that <code>$a</code> and <code>$b</code> have in regard to strict by simply importing a module? </p> <p>First of all some setup. The following works: </p> <pre><code>#!/bin/perl use strict; print "\$a=$a\n"; print "\$b=$b\n"; </code></pre> <p>If I add one more line: </p> <pre><code>print "\$c=$c\n"; </code></pre> <p>I get an error at compile time, which means that none of my <em>dazzling</em> print code gets to run. </p> <p>If I comment out <code>use strict;</code> it runs fine. Outside of strictures, <code>$a</code> and <code>$b</code> are mainly special in that <code>sort</code> passes the two values to be compared with those names. </p> <pre><code>my @reverse_order = sort { $b &lt;=&gt; $a } @unsorted; </code></pre> <p>Thus the main <em>functional</em> difference about <code>$a</code> and <code>$b</code>--even though Perl "knows their names"--is that you'd better know this when you sort, or use some of the functions in <a href="http://search.cpan.org/module?List::Util" rel="nofollow noreferrer">List::Util</a>. </p> <p>It's only when you use strict, that <code>$a</code> and <code>$b</code> become special variables in a whole new way. They are the only variables that strict will pass over without complaining that they are not declared.</p> <p><em>:</em> Now, I like strict, but it strikes me that if TIMTOWTDI (There is more than one way to do it) is Rule #1 in Perl, this is not very TIMTOWDI. It says that <code>$a</code> and <code>$b</code> are special and that's it. If you want to use variables you don't have to declare <code>$a</code> and <code>$b</code> are your guys. If you want to have three variables by adding <code>$c</code>, suddenly there's a whole other way to do it.</p> <p>Nevermind that in manipulating hashes <code>$k</code> and <code>$v</code> might make more sense:</p> <pre><code>my %starts_upper_1_to_25 = skim { $k =~ m/^\p{IsUpper}/ &amp;&amp; ( 1 &lt;= $v &amp;&amp; $v &lt;= 25 ) } %my_hash ;` </code></pre> <p>Now, I use and I like strict. But I just want <code>$k</code> and <code>$v</code> to be visible to <code>skim</code> for the most compact syntax. And I'd like it to be visible simply by </p> <pre><code>use Hash::Helper qw&lt;skim&gt;; </code></pre> <p>I'm not asking this question to know how to black-magic it. My "answer" below, should let you know that I know enough Perl to be dangerous. I'm asking if there is a way to make strict accept other variables, or what is the <em>cleanest</em> solution. The answer could well be no. If that's the case, it simply does not seem very TIMTOWTDI. </p>
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    1. COAlso I don't think strict does provide unqualified use of $a and $b. Try List::Utils 'reduce' and (unfortunately) it does give a warning about $a & $b.
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    2. COIn my tests in both 5.8 and 5.10, I could not get strict to squawk about $a and $b using List::Utils::reduce.
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    3. COAh... I always have "use warnings" in unison with "use strict". Its this that producing "used only once: possible typo" warnings (blimin annoying if that is the only "reduce" in there!
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