Comments on: if problems http://andyanglea.com/blog/2009/08/if-problems/ Fri, 12 Aug 2011 08:58:41 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Scott http://andyanglea.com/blog/2009/08/if-problems/#comment-297 Scott Wed, 23 Sep 2009 14:55:20 +0000 http://andyanglea.com/blog/?p=111#comment-297 Mrs. Anglea, I work in web design, and I'm really not sure either... :-P Mrs. Anglea, I work in web design, and I’m really not sure either… :-P

]]> By: andy http://andyanglea.com/blog/2009/08/if-problems/#comment-284 andy Sat, 29 Aug 2009 21:19:11 +0000 http://andyanglea.com/blog/?p=111#comment-284 @Mom, That's ok, i warned you. :P @Mom, That’s ok, i warned you. :P

]]> By: Mom http://andyanglea.com/blog/2009/08/if-problems/#comment-278 Mom Sat, 29 Aug 2009 13:33:20 +0000 http://andyanglea.com/blog/?p=111#comment-278 Oh, my! I should have taken your advice and moved on along! I have no earthly idea why counting parentheses would be fascinating to you! :) Oh, my! I should have taken your advice and moved on along! I have no earthly idea why counting parentheses would be fascinating to you! :)

]]> By: Duncan http://andyanglea.com/blog/2009/08/if-problems/#comment-277 Duncan Thu, 27 Aug 2009 16:56:44 +0000 http://andyanglea.com/blog/?p=111#comment-277 Now that I think about it, the "exceptional case" would compile just fine... but it would produce a logic error. I guess that's beyond the scope of this algorithm then, so we can't really say that this case "breaks" the algorithm. I'm sure more extensive use case analysis would produce other things to think about. Now that I think about it, the “exceptional case” would compile just fine… but it would produce a logic error.

I guess that’s beyond the scope of this algorithm then, so we can’t really say that this case “breaks” the algorithm.

I’m sure more extensive use case analysis would produce other things to think about.

]]> By: Duncan http://andyanglea.com/blog/2009/08/if-problems/#comment-276 Duncan Thu, 27 Aug 2009 15:48:20 +0000 http://andyanglea.com/blog/?p=111#comment-276 Here's a quick mock-up Ubiq command. This only does the left-to-right check. The right-to-left check should be pretty easy to implement by getting the array length and then looping down from arrayLength-1 to zero. Also, as I predicted, it didn't detect an error on the exceptional case. http://gist.github.com/176391 Here’s a quick mock-up Ubiq command. This only does the left-to-right check. The right-to-left check should be pretty easy to implement by getting the array length and then looping down from arrayLength-1 to zero.

Also, as I predicted, it didn’t detect an error on the exceptional case.

http://gist.github.com/176391

]]> By: andy http://andyanglea.com/blog/2009/08/if-problems/#comment-275 andy Thu, 27 Aug 2009 15:34:55 +0000 http://andyanglea.com/blog/?p=111#comment-275 @peter are you sure about that? doesn't that open the possibility, for example, that $condition1 != $a OR the len of $condition2, etc. rather than that $condition1 != $a OR that the len of $condition2 == $b. Eg. with $condition1 = 'foo' $condition2 = 'bar' $a = 1 $b = 2 'foo' != 1 OR 3 rather than 'foo' != 1 OR 3 == 2 @peter are you sure about that? doesn’t that open the possibility, for example, that $condition1 != $a OR the len of $condition2, etc. rather than that $condition1 != $a OR that the len of $condition2 == $b.

Eg. with
$condition1 = ‘foo’
$condition2 = ‘bar’
$a = 1
$b = 2
‘foo’ != 1 OR 3 rather than ‘foo’ != 1 OR 3 == 2

]]> By: Peter http://andyanglea.com/blog/2009/08/if-problems/#comment-274 Peter Thu, 27 Aug 2009 15:10:03 +0000 http://andyanglea.com/blog/?p=111#comment-274 I realize this is purely theoretical, but you also have 6 too many parenthesis. You could accomplish the same logic by not wrapping every condition in a parenthesis. Like thus: if ($condition1 != $a || (len($condition2) == $b && !isset($_POST['submit']))) I realize this is purely theoretical, but you also have 6 too many parenthesis. You could accomplish the same logic by not wrapping every condition in a parenthesis. Like thus:

if ($condition1 != $a || (len($condition2) == $b && !isset($_POST['submit'])))

]]> By: andy http://andyanglea.com/blog/2009/08/if-problems/#comment-273 andy Thu, 27 Aug 2009 15:06:13 +0000 http://andyanglea.com/blog/?p=111#comment-273 @peter yes, but notice i was using an online editor that didn't have a syntax checker... @duncan hmm, that's true about the case that breaks that algorithm, but i'd be interested in seeing that ubiquity plugin. I'll see if i can tweak something to use the pre tag... @peter yes, but notice i was using an online editor that didn’t have a syntax checker…
@duncan hmm, that’s true about the case that breaks that algorithm, but i’d be interested in seeing that ubiquity plugin. I’ll see if i can tweak something to use the pre tag…

]]> By: Duncan http://andyanglea.com/blog/2009/08/if-problems/#comment-272 Duncan Thu, 27 Aug 2009 14:31:53 +0000 http://andyanglea.com/blog/?p=111#comment-272 I just threw my test cases on github... this is enough for now, but this is still interesting to explore. http://gist.github.com/176329 I just threw my test cases on github… this is enough for now, but this is still interesting to explore.
http://gist.github.com/176329

]]> By: Duncan http://andyanglea.com/blog/2009/08/if-problems/#comment-270 Duncan Thu, 27 Aug 2009 14:29:38 +0000 http://andyanglea.com/blog/?p=111#comment-270 I just did some preliminary checking, and found one case that breaks this algorithm. If you're missing an equal number of open and closed parentheses, then it doesn't detect an error. Missing one ) and one ( case: 12 * *3 4 3 2 3 4 3210 !UNDETECTABLE ERROR 01 * *2 3 4 3 2 3 4321 !UNDETECTABLE ERROR if (($condition1 != $a || (len($condition2) == $b) && (!isset($_POST['submit'])))) { I just did some preliminary checking, and found one case that breaks this algorithm. If you’re missing an equal number of open and closed parentheses, then it doesn’t detect an error.

Missing one ) and one ( case:
12 * *3 4 3 2 3 4 3210 !UNDETECTABLE ERROR
01 * *2 3 4 3 2 3 4321 !UNDETECTABLE ERROR
if (($condition1 != $a || (len($condition2) == $b) && (!isset($_POST['submit'])))) {

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