I'm coming to Groovy from statically typed languages. And I don't understand what is the benefit of having an implicit conversion to bool? I see this feature quite controversial than useful.
A benefit of implicit casting (to boolean) in Groovy
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It's a convenience. It is easier and shorter to write conditions like
someMapthansomeMap!=null && !someMap.isEmpty(). Yes, there are libraries that can do both of those checks for you in a single call, but then you getMyAwesomeLibrary.makeThisTestForMe(someMap).With Groovy it's just less code.
Also, you can customize the behavior by overriding the
asBooleanmethod to whatever you like/need for whatever reason.