Re: Unexpected comparison behavior change in 4.5.1
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 48766
interpreted = N
texte = explain.- ckOn Tuesday, March 18, 2003, at 12:25 PM, Velma Kahn wrote:> Brian is quite correct, as far as I can see. > Velma > > > At 12:21 PM 3/18/2003, you wrote: >> Brian, >> >> That is not correct. >> >> bob is a string consisting of the letters 'bob' it DOES contain 'b' >> (which is what the ^ means to WebDNA) it does not contain '' which is >> what [showif bob^] means as well as [if bob^]. Both these >> statements are FALSE. >> >> Someone correct me if I'm wrong please :) >> >> - Charles >> >> >> On Tuesday, March 18, 2003, at 10:29 AM, Brian Fries wrote: >> >>> Your description is inconclusive. If I was checking for b, then, >>> to paraphrase you: >>> >>> What your comparison is saying IF bob contains b then true. bob >>> contains bob therefore is false in both cases. >>> >>> This is not a test for equality, and bob contains NOTHING an >>> infinite number of times. >>> >>> Again, I'm not saying that one result is better than the other - >>> logically it's an inconclusive test. What I am saying is that, since >>> it's inconclusive, it SHOULD NOT HAVE BEEN CHANGED WITHOUT GOOD >>> REASON AND WITHOUT NOTIFYING DEVELOPERS THAT THEIR CODE MIGHT BREAK. >>> >>> SMSI: Comments? Scott? Please? >>> >>> - brian >>> >>> On Tuesday, March 18, 2003, at 12:47 AM, Charles Kline wrote: >>> >>>> What your comparison is saying IF bob contains NOTHING then true. >>>> bob contains bob therefore is false in both cases. >>>> >>>> On Tuesday, March 18, 2003, at 01:56 AM, Brian Fries wrote: >>>> >>>>> On Monday, March 17, 2003, at 10:38 PM, Charles Kline wrote: >>>>> >>>>>> >>>>>> On Tuesday, March 18, 2003, at 01:32 AM, Brian Fries wrote: >>>>>> >>>>>>> [showif bob^] >>>>>>> >>>>>>> or >>>>>>> >>>>>>> [if bob^] >>>>>>> >>>>>>> >>>>>>> In my tests, these evaluate to true under 4.5.0 and earlier, >>>>>>> and to false under 4.5.1. Clearly URL is not the issue here. >>>>>> [showif bob^] should evaluate to 'false' so it seems the bug was >>>>>> in 4.5.0 >>>>> >>>>> And WHY should [showif bob^] evaluate false? I don't see anything >>>>> in the empty string that isn't also in bob, therefore I - and >>>>> every version of WebDNA prior to 4.5.1 - would expect it to >>>>> evaluate to > true. >>>>> >>>>>> >>>>>> [if bob^] should evaluate to 'false' as well. >>>>> >>>>> Again, why is false any better than true for this? If WebDNA >>>>> were being written from scratch, then it would be the right time >>>>> to make a choice on this. But, since it's worked the same way >>>>> since I began using the product in 1997, I think its a little late >>>>> to make this change. >>>>> >>>>> I'm not really here to debate which way it SHOULD resolve the >>>>> comparison, I'm only here to point out that it broke my code - >>>>> which was fully tested and had been working fine for years. >>>>> >>>>>> It was always my understanding that when using [if] to compare >>>>>> strings, they needed to be in quotes. Was in the docs. as that >>>>>> from the beginning. >>>>> >>>>> Relevance? What quotes do you see missing from my example? >>>>> >>>>> - brian >>> >>> >>> ------------------------------------------------------------- >>> This message is sent to you because you are subscribed to >>> the mailing list
. >>> To unsubscribe, E-mail to: >>> To switch to the DIGEST mode, E-mail to >>> >>> Web Archive of this list is at: http://webdna.smithmicro.com/ >> >> >> ------------------------------------------------------------- >> This message is sent to you because you are subscribed to >> the mailing list . >> To unsubscribe, E-mail to: >> To switch to the DIGEST mode, E-mail to >> >> Web Archive of this list is at: http://webdna.smithmicro.com/ > > ---------------------------------------- > Velma Kahn > Glory Day Software Company > 200 Tanager Ln NW, Floyd, Virginia 24091, U.S.A. > phone: 540-745-6469 * fax: 651-321-4884 > email: vkahn@glorydaysoftware.com > http://www.glorydaysoftware.com > http://www.communitymade.com > http://www.floydcrafts.com > > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > > Web Archive of this list is at: http://webdna.smithmicro.com/ > ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Associated Messages, from the most recent to the oldest:
explain.- ckOn Tuesday, March 18, 2003, at 12:25 PM, Velma Kahn wrote:> Brian is quite correct, as far as I can see. > Velma > > > At 12:21 PM 3/18/2003, you wrote: >> Brian, >> >> That is not correct. >> >> bob is a string consisting of the letters 'bob' it DOES contain 'b' >> (which is what the ^ means to WebDNA) it does not contain '' which is >> what [showif bob^] means as well as [if bob^]. Both these >> statements are FALSE. >> >> Someone correct me if I'm wrong please :) >> >> - Charles >> >> >> On Tuesday, March 18, 2003, at 10:29 AM, Brian Fries wrote: >> >>> Your description is inconclusive. If I was checking for b, then, >>> to paraphrase you: >>> >>> What your comparison is saying IF bob contains b then true. bob >>> contains bob therefore is false in both cases. >>> >>> This is not a test for equality, and bob contains NOTHING an >>> infinite number of times. >>> >>> Again, I'm not saying that one result is better than the other - >>> logically it's an inconclusive test. What I am saying is that, since >>> it's inconclusive, it SHOULD NOT HAVE BEEN CHANGED WITHOUT GOOD >>> REASON AND WITHOUT NOTIFYING DEVELOPERS THAT THEIR CODE MIGHT BREAK. >>> >>> SMSI: Comments? Scott? Please? >>> >>> - brian >>> >>> On Tuesday, March 18, 2003, at 12:47 AM, Charles Kline wrote: >>> >>>> What your comparison is saying IF bob contains NOTHING then true. >>>> bob contains bob therefore is false in both cases. >>>> >>>> On Tuesday, March 18, 2003, at 01:56 AM, Brian Fries wrote: >>>> >>>>> On Monday, March 17, 2003, at 10:38 PM, Charles Kline wrote: >>>>> >>>>>> >>>>>> On Tuesday, March 18, 2003, at 01:32 AM, Brian Fries wrote: >>>>>> >>>>>>> [showif bob^] >>>>>>> >>>>>>> or >>>>>>> >>>>>>> [if bob^] >>>>>>> >>>>>>> >>>>>>> In my tests, these evaluate to true under 4.5.0 and earlier, >>>>>>> and to false under 4.5.1. Clearly URL is not the issue here. >>>>>> [showif bob^] should evaluate to 'false' so it seems the bug was >>>>>> in 4.5.0 >>>>> >>>>> And WHY should [showif bob^] evaluate false? I don't see anything >>>>> in the empty string that isn't also in bob, therefore I - and >>>>> every version of WebDNA prior to 4.5.1 - would expect it to >>>>> evaluate to > true. >>>>> >>>>>> >>>>>> [if bob^] should evaluate to 'false' as well. >>>>> >>>>> Again, why is false any better than true for this? If WebDNA >>>>> were being written from scratch, then it would be the right time >>>>> to make a choice on this. But, since it's worked the same way >>>>> since I began using the product in 1997, I think its a little late >>>>> to make this change. >>>>> >>>>> I'm not really here to debate which way it SHOULD resolve the >>>>> comparison, I'm only here to point out that it broke my code - >>>>> which was fully tested and had been working fine for years. >>>>> >>>>>> It was always my understanding that when using [if] to compare >>>>>> strings, they needed to be in quotes. Was in the docs. as that >>>>>> from the beginning. >>>>> >>>>> Relevance? What quotes do you see missing from my example? >>>>> >>>>> - brian >>> >>> >>> ------------------------------------------------------------- >>> This message is sent to you because you are subscribed to >>> the mailing list . >>> To unsubscribe, E-mail to: >>> To switch to the DIGEST mode, E-mail to >>> >>> Web Archive of this list is at: http://webdna.smithmicro.com/ >> >> >> ------------------------------------------------------------- >> This message is sent to you because you are subscribed to >> the mailing list . >> To unsubscribe, E-mail to: >> To switch to the DIGEST mode, E-mail to >> >> Web Archive of this list is at: http://webdna.smithmicro.com/ > > ---------------------------------------- > Velma Kahn > Glory Day Software Company > 200 Tanager Ln NW, Floyd, Virginia 24091, U.S.A. > phone: 540-745-6469 * fax: 651-321-4884 > email: vkahn@glorydaysoftware.com > http://www.glorydaysoftware.com > http://www.communitymade.com > http://www.floydcrafts.com > > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > > Web Archive of this list is at: http://webdna.smithmicro.com/ > ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Charles Kline
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