ABAP TRY CATCH: performance? best practices? [closed] - try-catch

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How is TRY/CATCH in ABAP w.r.t. performance? Does it cost resources? If so, TRY/CATCH should be placed outside a loop, I guess.
What are there best practices in ABAP w.r.t. TRY/CATCH?

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I have learned in class that driving a car is considered as partially because AI can't know what the other driver's emotion is nor what is around the corner. Or in some case chess, it is fully observable because the AI can see both AI's piece and opponent piece. But what about knitting? does it need to see around its own environment? is it deterministic because there's no miscalculation?

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Most of the pre-commit check tools I have used with different organizations do not allow whitespace at the end of lines. What is the motivation for this? Can it cause different behaviour, increase flash memory usage, or is it just a stylistic thing?

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I have a variable that I would like to be shared across multiple threads, and have it be incremented only once when all of the threads have used its current value. What is the best way to accomplish this in C?

What rough spots or omissions in the GAE docs tripyou up or cost you time? [closed]

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If you could wave the magic wand and fix something in the GAE 1.5.5 documentation that have caused you lost time, grief, or missed opportunities, what would they be?
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Must read resources for NoSQL developers [closed]

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Can you recommend any resources every NoSQL developer should be familiar with?
Here's a nice link collection to databases, forums, articles and other resources:
http://nosql-database.org/
one of the "must read" resources for a developer, NoSQL or not, is "the source code"

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