Re: over loading

Suppose these two scenarios:

you are working on this program which has many variables, and you were a bit niggardly naming your variables in a nice, comprehensible concept, you ended up initializing the same variable twice unintentionally and with different values, your program starts working, but the results that're coming out are not what you expect. You could not see that coming because you did not use the strictures.
The most chanted mantras in the Grand Monastery is "use strict, use warnings" .
You have a string variable, $string="hello", however, at some part of your program you wanted to carry out an operation that involves incrementation of a number variable, inadvertently you typed $string++ when you wanted to type $number++, the program worked, giving you a weird result, how would you detect that you were incrementing a string where you should've been incrementing a number unless you switched warnings on?
The most chanted mantras in the Grand Monastery is "use strict, use warnings".

$number = 3;
$number = 4;
$string = "Hello";
$string ++
print "$var\n";    #would print 4 and overwrite 3.
print "$string";  #prints "hellp" and you don't know why "hello" didn'
+t print
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The same concept can be stretched further to subroutines naming and conventions so be careful and happy Perl Programming :)

(UPDATED): Made some amendment to cover two scenarios.

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Re^2: over loading by GrandFather (Saint) on Aug 20, 2009 at 21:41 UTC
Except that $string++ not only doesn't generate errors or warnings, but is in fact a highly useful DWIMism of Perl: `use warnings; use strict; my $letter = 'a'; print $letter++ for 1 .. 26; print "\n"; my $serial = 'S001'; printf "%s, ", $serial++ for 1 .. 10;` [download] Prints: `abcdefghijklmnopqrstuvwxyz S001, S002, S003, S004, S005, S006, S007, S008, S009, S010,` [download] True laziness is hard work	[reply] [d/l] [select]

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Re^2: over loading
by GrandFather (Saint) on Aug 20, 2009 at 21:41 UTC

Except that $string++ not only doesn't generate errors or warnings, but is in fact a highly useful DWIMism of Perl:

use warnings;
use strict;

my $letter = 'a';
print $letter++ for 1 .. 26;
print "\n";

my $serial = 'S001';
printf "%s, ", $serial++ for 1 .. 10;
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Prints:

abcdefghijklmnopqrstuvwxyz
S001, S002, S003, S004, S005, S006, S007, S008, S009, S010,
[download]

True laziness is hard work

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