Re: how are variables passed from functions?

Hugh Senior wrote: Agreed... Leave the existing behaviour alone. It is not a bug but an undocumented feature. And yes, it will break at least one of my products if changed! When I submitted the request to the bug DB I'd hoped for either a fix or an explanation, whichever the engine team

Re: how are variables passed from functions?

Agreed... Leave the existing behaviour alone. It is not a bug but an undocumented feature. And yes, it will break at least one of my products if changed! This issue has already been discussed some time ago. It was determined to leave the behaviour unchanged for both flexibility and backwards

Re: how are variables passed from functions?

Definitely bug. This is incorrect behaviour. On 15/11/2014, at 12:00 PM, use-livecode-requ...@lists.runrev.com wrote: On 11/14/2014, 5:28 PM, Bob Sneidar wrote: I guess what I am saying is that since test1 did not*explicitly* return anything, the mouseUp handler should put nothing in the

Re: how are variables passed from functions?

J. Landman Gay wrote: I'm trying to understand how it follows any known rule of messaging. I don't see it yet. To me it looks like a bug. Agreed - reported as such: http://quality.runrev.com/show_bug.cgi?id=14034 We'll either get a fix or an explanation; either would be useful. -- Richard

Re: how are variables passed from functions?

Jacque- Friday, November 14, 2014, 5:46:08 PM, you wrote: On 11/14/2014, 5:28 PM, Bob Sneidar wrote: I guess what I am saying is that since test1 did not*explicitly* return anything, the mouseUp handler should put nothing in the message box. However I am discovering that

Re: how are variables passed from functions?

Assuming that this has been the behaviour of Metacard, Revolution, Livecode (and possibly Hypercard) for 22 years (or more), it is perhaps best just accepted as a fait accompli. If no-one has noticed this aberrant behaviour in those 2 (or more decades), then fixing it now might well lead to

Re: how are variables passed from functions?

On 11/15/2014, 11:55 AM, Mark Wieder wrote: I've only followed this thread sporadically because it's been a busy week at work, but I'm quite amused. This is the way ruby works, and if memory serves, go works the same way. The last statement executed is the current result. That's what I get for

Re: how are variables passed from functions?

Jacque- Saturday, November 15, 2014, 10:44:33 AM, you wrote: That's what I get for being a one-trick pony. But it sure seems that having to keep track of the last result would cause a lot of non-obvious errors. I'm not necessarily saying I like it, I've just gotten used to it in ruby because

Re: how are variables passed from functions?

On 11/15/2014, 3:43 PM, Mark Wieder wrote: What I'd like in LC is for the compiler to barf if a function has no return statement, or if it has a return statment with no returned parameter. I like it. Then we wouldn't have all those multi-lingual LiveCoders using return instead of exit. :)

Re: how are variables passed from functions?

On Sun, Nov 16, 2014 at 2:44 AM, J. Landman Gay jac...@hyperactivesw.com wrote: That's what I get for being a one-trick pony. But it sure seems that having to keep track of the last result would cause a lot of non-obvious errors. Bernard mentioned it might be long-standing behavior that

Re: how are variables passed from functions?

Also from the Dictionary entry for return: To halt the current handler without returning a result, use the exit control structure instead. On Sun, Nov 16, 2014 at 8:01 AM, Kay C Lan lan.kc.macm...@gmail.com wrote: On Sun, Nov 16, 2014 at 2:44 AM, J. Landman Gay jac...@hyperactivesw.com wrote:

how are variables passed from functions?

By accident I noticed that I don't have a return at a certain point of a function but nevertheless the value was passed back without a return to the calling handler. I can reproduce the issue to this scenario: --Btn script on mouseUp put foo1() into myVar1 -- I get the value Test

Re: how are variables passed from functions?

Interesting. If I modify foo1 like that: function foo1 put foo2() into myvar2 put anotherTest into myvar3 end foo1 the process still returns “Test”. I can only guess that ‘return’ saves the returned value in a ‘last in, first out’ pile somewhere and that the top value is used by the

Re: how are variables passed from functions?

-Original Message- From: Tiemo Hollmann TB toolb...@kestner.de To: 'How to use LiveCode' use-livecode@lists.runrev.com Sent: Fri, Nov 14, 2014 3:47 am Subject: how are variables passed from functions? By accident I noticed that I don't have a return at a certain point of a function but nevertheless

AW: how are variables passed from functions?

Gesendet: Freitag, 14. November 2014 16:12 An: use-livecode@lists.runrev.com Betreff: Re: how are variables passed from functions? I don't see any anomaly here. Since the intermediate function calls yet another function, it never needs to close, that is, return, a value. It is a pass-through

Re: how are variables passed from functions?

of these intermediate handlers. Craig -Original Message- From: Tiemo Hollmann TB toolb...@kestner.de To: 'How to use LiveCode' use-livecode@lists.runrev.com Sent: Fri, Nov 14, 2014 10:38 am Subject: AW: how are variables passed from functions? Hi Craig, I wasn't aware of this behaviour. I

AW: how are variables passed from functions?

] Im Auftrag von dunb...@aol.com Gesendet: Freitag, 14. November 2014 17:00 An: use-livecode@lists.runrev.com Betreff: Re: how are variables passed from functions? Hi. Putting intermediate returns will immediately terminate the function call. How would you reach the next stage

Re: how are variables passed from functions?

Nachricht- Von: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] Im Auftrag von dunb...@aol.com Gesendet: Freitag, 14. November 2014 17:00 An: use-livecode@lists.runrev.com Betreff: Re: how are variables passed from functions? Hi. Putting intermediate returns

Re: how are variables passed from functions?

Tiemo, Interesting. It looks like functions return the value of the result in the absence of a return statement. Other languages would probably return void or null or something similar, and we might expect Livecode to return empty. I've no opinion on whether it is a bug or not, but I think it

Re: how are variables passed from functions?

Yes, it is ’the Result’, I just checked it - good hint, Dave ! didn’t think about that before… Jacques Le 14 nov. 2014 à 17:56, Dave Cragg dave.cr...@lacscentre.co.uk a écrit : Tiemo, Interesting. It looks like functions return the value of the result in the absence of a return

Re: how are variables passed from functions?

@lists.runrev.com Sent: Fri, Nov 14, 2014 11:21 am Subject: AW: how are variables passed from functions? Hi Craig, perhaps I didn't expressed myself correct, I'm not a native speaker. For me the result seems the same, if I put a return myVar2 at the end of function foo1 or not (see below). The intermediate

Re: how are variables passed from functions?

For anything other than this simple case, the returns matter. Take for example local tvar1,tvar2,tvar3 on mouseUp --get a random value to use put random(10) into tvar1 put Start Value: tvar1 cr Final Return: myfunc1(tvar1) cr tvar3 end mouseUp function myfunc1 pvar put 2 *

Re: how are variables passed from functions?

The value returned in the previous scenario (basing the return on 10 being the number used) is 20. The final doubling disappears. On Fri, Nov 14, 2014 at 10:40 AM, Mike Bonner bonnm...@gmail.com wrote: For anything other than this simple case, the returns matter. Take for example local

Re: how are variables passed from functions?

Hi Tiemo, That seems like an unexpected behavior to me but definitely good to know. I've christened this behavior the point of no return! I'm triyng to wrap my head around what might happen in this scenario with a recursive function. Pete lcSQL Software http://www.lcsql.com Home of

Re: how are variables passed from functions?

On 11/14/2014, 9:12 AM, dunb...@aol.com wrote: I don't see any anomaly here. Since the intermediate function calls yet another function, it never needs to close, that is, return, a value. It is a pass-through entity, a card carrying member of the chain of handler calls. Step through this

Re: how are variables passed from functions?

Not sure what you are asking, but here is how functions work. As soon as the script execution encounters a return command, the function terminates and returns control to the calling handler. Nothing that comes after the return in the function is executed. Now here is what weirds me out: on

Re: how are variables passed from functions?

I agree with you Jacque. I think the only workaround is when creating a function, immediately enter the return command before scripting anything else. This will prevent the inadvertent exclusion of a return command Bob S On Nov 14, 2014, at 10:28 , J. Landman Gay

Re: how are variables passed from functions?

test2 function test3 return blah3 end test3 -Original Message- From: Bob Sneidar bobsnei...@iotecdigital.com To: How to use LiveCode use-livecode@lists.runrev.com Sent: Fri, Nov 14, 2014 2:36 pm Subject: Re: how are variables passed from functions? Not sure what you are asking

Re: how are variables passed from functions?

I guess what I am saying is that since test1 did not *explicitly* return anything, the mouseUp handler should put nothing in the message box. However I am discovering that functions *implicitly* return data that the programmer did not tell them to return. Some find this ok. I find it

Re: how are variables passed from functions?

On 11/14/2014, 5:28 PM, Bob Sneidar wrote: I guess what I am saying is that since test1 did not*explicitly* return anything, the mouseUp handler should put nothing in the message box. However I am discovering that functions*implicitly* return data that the programmer did not tell them to return.