Re: Unexpected comparison behavior change in 4.5.1
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 48765
interpreted = N
texte = 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/
Associated Messages, from the most recent to the oldest:
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/
Velma Kahn
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