Tiny mistake, BIG problem - Tilted Forum Project Discussion Community

ratbastid · 10-13-2003, 10:56 AM

Just in case any of you were wondering, when you're working in Perl, building a select box of shipping rates, there's a HUGE difference between this:

<code>
foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %$rates) {
  $option_list .= '<option value="' . $ups->servicenames($key) . $rates->{$key} . "\">$key - $rates->{$key}</option>\n";
}
</code>

And:<code>
foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %$rates) {
  $option_list .= '<option value="' . $ups->servicenames($key) . $rates->{$key} "\">$key - $rates->{$key}</option>\n";
}
</code>

One dot makes all the difference between "runs" and "not runs". That dot is the difference between "happy customer" and "SAD customer".

What obnoxious little spelling errors have YOU programmed recently?

Fallon · 10-13-2003, 03:11 PM

Lets see...I think I missed a " somewhere and I spent three hours searching a 5k line file for where the error was. That I think was my most recent

The_Dude · 10-13-2003, 04:11 PM

Quote:

int x = (int)(Math.Random() * 3)+1;

i was like why wasnt it workin, then i realized that "Random" shouldnt start w/ a capital letter.

case sensitive bastards.

juanvaldes · 10-13-2003, 04:22 PM

Quote:

Originally posted by The_Dude
case sensitive bastards.

Welcome to the wide world of programming.

Mephisto2 · 10-13-2003, 04:27 PM

Programmers scare me.

I don't have a very "structured" mind that can look at things in a "logical" manner. My mind is all over the place, jumping from topic to topic, trying to understand the Big Picture etc.

Makes me a good PM, but I would be crap at programming...

Mr Mephisto

ratbastid · 10-13-2003, 05:35 PM

Quote:

Originally posted by The_Dude
case sensitive bastards.

Yeah. They're also real shits when it comes to spelling. Picky, picky!

Okay, so "print" isn't spelled with a "g" on the end. You knew what I MEANT!!!

seretogis · 10-13-2003, 07:45 PM

Oh man. You have no idea how wonderful that syntax highlighting in vim is until you try to work without it. I used to find it irritating to begin with, but now I can't work without it.

cliche · 10-13-2003, 11:57 PM

I still have a habit of leaving out semicolons, which always seems to throw up random entertaining errors.

Silvy · 10-14-2003, 12:14 AM

Debugging?
Try any program in Miranda...
It keeps throwing up errors like

Code:

type [[[[[[[[]]]]]]]] is unequal to [[[[[[[]]]]]]]

Tiny source, easy problem, but reading the error... sheesh!

Lebell · 10-14-2003, 01:20 AM

O vs 0.

I spent a day tearing out my hair (much thicker then) over this one.

seretogis · 10-14-2003, 04:12 AM

Quote:

Originally posted by Lebell
O vs 0.

I spent a day tearing out my hair (much thicker then) over this one.

Ouch! May I suggest changing fonts?

peacy · 10-14-2003, 05:07 AM

Mine wasn't really a spelling error. But I started crying when after 2 days of debugging and no sleeping I finally found the "//FJD" remark in the code. (Just For Debug).
After removing couple of lines after the remark everything worked like a charm...

Quote:

Originally posted by ratbastid
<code>
foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %$rates) {
  $option_list .= '<option value="' . $ups->servicenames($key) . $rates->{$key} "\">$key - $rates->{$key}</option>\n";
}
</code>

A remark about the perl code:
In the "foreach" line when you use the when you use "keys" it's not necessary to write %$. The % is enough. Like this:
<code>
foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %rates)
</code>

ratbastid · 10-14-2003, 05:29 AM

Quote:

Originally posted by peacy
A remark about the perl code:
In the "foreach" line when you use the when you use "keys" it's not necessary to write %$. The % is enough. Like this:
<code>
foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %rates)
</code>

Not when you're working with a hashref, it's not. The hash reference $rates must be "hashified" by spelling it %$rates as an argument to the keys() function. Otherwise you're talking about the HASH %rates which, in this code snippet, is undefined.

Try running the following code:

Code:

#!/usr/bin/perl

my $hashref;
my %hash;

%hash = ( a => 1, b => 2);
$hashref = \%hash;

print "Foreaching through \%hash:\n";
foreach my $key (keys %hash) {
&nbsp;&nbsp;print "$key -> $hash{$key}\n";
}

print "\nForeaching through \$hashref:\n";
foreach $key (keys %$hashref) {
&nbsp;&nbsp;print "$key -> $hashref->{$key}\n";
}

print "\nForeaching through \$hashref treated like a hash:\n";
foreach $key (keys %hashref) {
&nbsp;&nbsp;print "$key -> $hashref->{$key}\n";
}

print "\nDone!\n";
exit(0);

This is ANOTHER thing I've learned by making stupid one-character mistakes!

peacy · 10-14-2003, 05:35 AM

Quote:

Originally posted by ratbastid
Not when you're working with a hashref, it's not. The hash reference $rates must be "hashified" by spelling it %$rates as an argument to the keys() function. Otherwise you're talking about the HASH %rates which, in this code snippet, is undefined.

Ok... From the original code I didn't realize (at first sight) that it's a ref... Should've known it...

10-13-2003, 10:56 AM	#1 (permalink)
ratbastid Darth Papa Location: Yonder	Tiny mistake, BIG problem Just in case any of you were wondering, when you're working in Perl, building a select box of shipping rates, there's a HUGE difference between this: <code> foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %$rates) {   $option_list .= '<option value="' . $ups->servicenames($key) . $rates->{$key} . "\">$key - $rates->{$key}</option>\n"; } </code> And:<code> foreach my $key (sort {$rates->{$a} <=> $rates->{$b}} keys %$rates) {   $option_list .= '<option value="' . $ups->servicenames($key) . $rates->{$key} "\">$key - $rates->{$key}</option>\n"; } </code> One dot makes all the difference between "runs" and "not runs". That dot is the difference between "happy customer" and "SAD customer". What obnoxious little spelling errors have YOU programmed recently?

10-13-2003, 07:45 PM	#7 (permalink)
seretogis Huggles, sir? Location: Seattle	Oh man. You have no idea how wonderful that syntax highlighting in vim is until you try to work without it. I used to find it irritating to begin with, but now I can't work without it. __________________ seretogis - sieg heil perfect little dream the kind that hurts the most, forgot how it feels well almost no one to blame always the same, open my eyes wake up in flames

10-13-2003, 11:57 PM	#8 (permalink)
cliche Rookie Location: Oxford, UK	I still have a habit of leaving out semicolons, which always seems to throw up random entertaining errors. __________________ I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)

10-14-2003, 12:14 AM	#9 (permalink)
Silvy paranoid Location: The Netherlands	Debugging? Try any program in Miranda... It keeps throwing up errors like Code: type [[[[[[[[]]]]]]]] is unequal to [[[[[[[]]]]]]] Tiny source, easy problem, but reading the error... sheesh! __________________ "Do not kill. Do not rape. Do not steal. These are principles which every man of every faith can embrace. " - Murphy MacManus (Boondock Saints)

10-14-2003, 01:20 AM	#10 (permalink)
Lebell Cracking the Whip Location: Sexymama's arms...	O vs 0. I spent a day tearing out my hair (much thicker then) over this one. __________________ "Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." – C. S. Lewis The ONLY sponsors we have are YOU! Please Donate!

10-13-2003, 03:11 PM	#2 (permalink)
Fallon Junkie Location: RI	Lets see...I think I missed a " somewhere and I spent three hours searching a 5k line file for where the error was. That I think was my most recent

10-13-2003, 04:27 PM	#5 (permalink)
Mephisto2 Junkie	Programmers scare me. I don't have a very "structured" mind that can look at things in a "logical" manner. My mind is all over the place, jumping from topic to topic, trying to understand the Big Picture etc. Makes me a good PM, but I would be crap at programming... Mr Mephisto