Is it possible to exit a loop when certain conditions are met? Say i want to exit the loop when my global variable is greater than 10. Is this possible?

I wish I knew the answer! For your information, you can look at this other open thread: "[How to?] exit a loop when a condition is met?"
http://openkapow.com/forums/thread/8359.aspx

Here's a sample how you can "quit' a for-each loop:

http://openkapow.com/files/folders/tutorials_and_examples/entry10637.aspx 

 

You are not exiting the loop. You seem to run the whole loop and if a test fails, you increase the counter and re-test again.

The question is how to *really* exit a loop: if a condition is false, then go out of the loop, do not increment the counter, do not retest. something like "repeat... until". To my knowledge, this is not possible in Robomaker. I hope it will come in a future release.

ppow:

You are not exiting the loop. You seem to run the whole loop and if a test fails, you increase the counter and re-test again.

The question is how to *really* exit a loop: if a condition is false, then go out of the loop, do not increment the counter, do not retest. something like "repeat... until". To my knowledge, this is not possible in Robomaker. I hope it will come in a future release.

 

You are right! That was the reason why I wrote "quite" between  quotes. But I gave Bighero a working solution for his problem...

 

Btw. Why do you need a repeat/until functionality ? (I can always learn)

"Repeat / until" is the equivalent of exiting a loop when a condition is met:

Repeat
  Action
Until ConditionA is true

is similar to

Loop: For i=1 ->10
  Action
  If conditionA then exit loop
Next (go back to the begining of the loop)

Thanks for your explanation but I know how a repeat/until works. But do you have an example of a application/robot where you need this kind of a loop ?  Or is just a "shorter way" of programming of a robot the reason that you want this feature?

 

Sorry, I misread you there.

I prefer repeat/until to a plain loop just for performance reasons. I do not want to run and fail the same test over and over again in a loop.

A typical application is when I want to create a RSS feed with the top 2 stories based on a condition (containing a keyword or something). My For each tag loop would return hundreds of entries, but when I find 2 entries matching a condition, then I want to escape. This is because new data comes now and then, so it is most efficient to create a RSS feed with 2 entries only.

I agree with you that  that a repeat/until loop could be very usefull but because of different reason.

 Typically for RSS feeds is that performance is not an issue. The loop is completely cached in the roboserver so even with hundreds of items I don't think performance is an issue BUT... if you have to "click" each item to get the full text then performance IS an issue. And moreover, the siteowner won't be that happy with so many useless clicks in the sitestatistics. So you got my vote.

AHA. "Test Attributes" was just what i needed. I looked for something called "if then" but failed. Guess I was looking in the wrong place.

Thanks  a bunch