30 дек. 2009 г. · I highly doubt that instanceof would be cause any performance issues. If you need to use it, I would say go for it, and then reconsider only if you're running ...

3 мая 2018 г. · typeof will return one of the built in types (Object, undefined and the primitives) while you get to control the right side of the instanceof operand.

19 сент. 2008 г. · Your question is about whether instanceof is significantly/surprisingly slower than checking the class object with ==, and I've found that it is not.

5 апр. 2016 г. · Class.isInstanceOf() is an intrinsic method in OpenJDK (and possibly in every modern VM), meaning that it's as fast as possible.

8 мая 2011 г. · in V8 (Chrome's JS engine), there seems to be little-to-no performance hit: > function A(){} > function B(){} > function C(){} > function ...

20 июн. 2018 г. · Can someone explain me why variant with instanceof faster 350 times than variant with class name switching with strings?

29 авг. 2018 г. · instanceof is faster. Changing one method of my app to instanceof if-else (7 classes), instead of polymorphism, reduced its load by almost 3%.

20 янв. 2012 г. · Use isAssignableFrom (which is resolved dynamically) in only the top level class. Makes for much concise code and you dont have to overload a third method.

11 февр. 2011 г. · It does generate some overhead, combined with the subsequent casting. With recent version of Java the overhead has decreased.

17 июн. 2015 г. · Yes, in general using `instanceof`` is a symptom of a bad/poor design. The trick is to use double dispatch or visitor pattern. Look on the web.