November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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15.23. Wykorzystywanie pułapek w aplikacjach internetowych
Problem
W aplikacji Rails jest błąd, którego nie można znaleźć na podstawie komunikatów w dziennikach zdarzeń. Potrzebne jest narzędzie debugowania umożliwiające pełną kontrolę stanów aplikacji w określonym punkcie.
Rozwiązanie
Biblioteka breakpoint umożliwia zatrzymanie wykonywania kodu i przejście do irb — interaktywnej sesji Ruby. W środowisku irb można sprawdzać wartości zmiennych lokalnych w bieżącym zasięgu, modyfikować te zmienne oraz wznawiać działanie kodu. Jeśli ktoś próbował kiedyś znaleźć błąd poprzez umieszczanie komunikatów diagnostycznych w kodzie, przekona się, że pułapki (breakpoints) zapewniają znacznie łatwiejszy i wygodniejszy sposób debugowania.
Ale jak ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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