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Mike_Hamer (1) [Avatar] Offline
Hello. First off, great job on the second edition! Loving it so far.

Just thought i'd chime in and mention that I found this sentence about assertions on page 31 to be slightly misleading

"The assertion reveals that for the remainder of the code, it’s assumed that y has the value 1"

Being a total noob, my first thought after reading this sentence was that assert statements were somehow constantly checked for the lifetime of the application, and that if their expressions ever evaluated to false, that the assertion would fail.

Of course after firing up the Groovy console and trying it out for myself I discovered that this was not the case, but I think it would be better if it were worded more like

"The assertion reveals that at this line in the code, it’s assumed that y has the value 1"

Mittie (397) [Avatar] Offline
Well, spotted, thanks!

It never occurred to me that this is could be interpreted as a constantly checked invariant.
But now, that you say it, ...

Thanks for posting and your kind words