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#81477 - 2003-01-24 10:48 AM Continue-Break in FOR-NEXT loops
UNIDAD UNIDAD Lurker Registered: 2003-01-24 Posts: 2 Loc: IBIZA (SPAIN)	Here is my suggestion: It would be very usefull to have "continue" and "break" statements within FOR-NEXT and WHILE-LOOP structures, as many languages have. I think this statements make code easier to write and read. Thanks for your attention.
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#81478 - 2003-01-24 11:08 AM Re: Continue-Break in FOR-NEXT loops
Jochen Jochen KiX Supporter Registered: 2000-03-17 Posts: 6380 Loc: Stuttgart, Germany	UNIDAD, all, Ruud, albeit some of the enthusiastics (aka 'Kixpharts') may cry 'easy to have without intrinsic support !', I'd like to second that request (did it once in another request and do it again) J. _________________________
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#81479 - 2003-01-24 11:44 AM Re: Continue-Break in FOR-NEXT loops
Richard H. Richard H. Administrator Registered: 2000-01-24 Posts: 4946 Loc: Leatherhead, Surrey, UK	I agree. It is always possible to code around the lack of break/continue, but you can achieve cleaner more elegant (and understandable) code using them. It'll reduce golf scores too, heh.
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#81480 - 2003-01-24 05:13 PM Re: Continue-Break in FOR-NEXT loops
Lonkero Lonkero KiX Master Guru Registered: 2001-06-05 Posts: 22346 Loc: OK	it will make code maybe 2 lines shorter in worst cases. it makes it easier to write, just like goto but... it does not make it easy to follow. I'm not against this, but neither I'm for. _________________________ ! download KiXnet
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#81481 - 2003-01-24 06:50 PM Re: Continue-Break in FOR-NEXT loops
Radimus Radimus Moderator Registered: 2000-01-06 Posts: 5187 Loc: Tampa, FL	I'd third that as well I'd also like a 'where' clause in the for each/next statements. the numeric loops already have a 'step' clause. _________________________ How to ask questions the smart way <-----------> Before you ask
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#81482 - 2003-01-24 06:54 PM Re: Continue-Break in FOR-NEXT loops
Lonkero Lonkero KiX Master Guru Registered: 2001-06-05 Posts: 22346 Loc: OK	now, where is purely different to continue or break which are similar to goto _________________________ ! download KiXnet
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#81483 - 2003-01-24 07:09 PM Re: Continue-Break in FOR-NEXT loops
Radimus Radimus Moderator Registered: 2000-01-06 Posts: 5187 Loc: Tampa, FL	but it performs the same sort of benefit in removing the if/endif that the break would provide for $a=0 to 10 if $a=6 break endif ? $a next for each $element in $array where $element<>'' ? $element next and is similar in concept to what a step parameter does _________________________ How to ask questions the smart way <-----------> Before you ask
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#81484 - 2003-01-24 07:13 PM Re: Continue-Break in FOR-NEXT loops
Les Les KiX Master Registered: 2001-06-11 Posts: 12734 Loc: fortfrances.on.ca	WHERE and/or UNTIL for each $element in $array until $element<>'' ? $element next _________________________ Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
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#81485 - 2003-01-24 07:18 PM Re: Continue-Break in FOR-NEXT loops
Lonkero Lonkero KiX Master Guru Registered: 2001-06-05 Posts: 22346 Loc: OK	sure, but it would keep the readability simpler and even it would be faster. and still, as a hater of goto, I keep hating continue. only places I've missed breaking of for-loops are the places where I need to code com stuff like wmi or adsi. if the bloody M$ would provide better interfaces, we would never need any breaking of any loops. _________________________ ! download KiXnet
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#81486 - 2003-01-28 04:59 PM Re: Continue-Break in FOR-NEXT loops
Wizard Wizard Hey THIS is FUN Registered: 2000-12-05 Posts: 264 Loc: Bristol, England	instead of Break, VB has Exit For, it does the same thing, but is easier to understand what is happening. IMO IF you have Break, are you 'Break'ing the For/If, or a function. With Exit, you could have a whole host of extras... Exit If, For, Function, ... Again, easier to understand. (sorry if it will put your golf scores back up ) W _________________________ Wizard There's no place like 127.0.0.1 vb \| kix \| batch \| html \| cfm \| js \| english
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#81487 - 2003-01-29 09:49 AM Re: Continue-Break in FOR-NEXT loops
Richard H. Richard H. Administrator Registered: 2000-01-24 Posts: 4946 Loc: Leatherhead, Surrey, UK	"break" is already a keyword, so another generic term would need to be chosen. "ExitLoop" or something. The reason for using a generic "break" (or similar) keyword rather than something explicit like "exit for" is that it is used to break out of a control structure regardless of type. The benefits may not be obvious until you consider nested control structures, and where you are supporting a count parameter for break. Some languages support the count parameter (help me out guys, I can't remember which). 'C' does not support it, and there have been a number of times I've been stuck deep in nested loops and cursed it's omission. Usually in network related code for some peculiar reason. This allows you to break selectively out of nested loops for example: code: For Do While ExitLoop 2 Loop Until Next The "2" count will cause the code to break out of two nested loops, i.e. the While/Loop then the Do/Until constructs, but not the For/Next.
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#81488 - 2003-01-29 02:42 PM Re: Continue-Break in FOR-NEXT loops
Les Les KiX Master Registered: 2001-06-11 Posts: 12734 Loc: fortfrances.on.ca	the keyword EXIT already exists so one could simply build on it. It already has a dual purpose, to exit a script, or in the case of a UDF to exit the udf only. All that would be required are a few parameters. EXIT EXIT {value} EXIT FOR EXIT WHILE EXIT DO EXIT UDF You get the picture... _________________________ Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
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#81489 - 2003-01-29 03:39 PM Re: Continue-Break in FOR-NEXT loops
Richard H. Richard H. Administrator Registered: 2000-01-24 Posts: 4946 Loc: Leatherhead, Surrey, UK	Not a good idea, for two reasons. 1) In the example in my previous post, what you want to do is break out of two nested loops, both the "while" and the "do" loops. Of course you could have individual "Exit"s for each type of loop, but you are limiting it's functionality and usefulnes. 2) KiXtart is a free format language. "Exit" has an optional parameter. This means that given something a snippet of code like: code: Exit Do Until or the equivalent code: Exit Do Until The parser would have to make a decision about how to deal with the code. Is it an "Exit Do" with the "Until" being related to a "Do" encountered earlier in the script, or is it a solitary "Exit" followed by a Do/Until loop? It can be done, but it adds unnecessary complexity to the parser for no gain. As an aside, I have always thought that the exit value for "Exit" and "Quit" should be mandatory, not optional. The syntax is a poor choice in a free format language, and I guess is a historical oddity.
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