Approach I wrote a benchmark program to evaluate different implementations: instanceof implementation (as reference) object-orientated via an abstract class and @Override a test method using an own type implementation getClass() == _.class implementation I used jmh to run the benchmark with 100 warmup calls, 1000 iterations under measuring, and with 10 forks. So each option … Read more
instanceof The Left Hand Side (LHS) operand is the actual object being tested to the Right Hand Side (RHS) operand which is the actual constructor of a class. The basic definition is: Checks the current object and returns true if the object is of the specified object type. Here are some good examples and here … Read more
Use instanceof for custom types: var ClassFirst = function () {}; var ClassSecond = function () {}; var instance = new ClassFirst(); typeof instance; // object typeof instance == ‘ClassFirst’; // false instance instanceof Object; // true instance instanceof ClassFirst; // true instance instanceof ClassSecond; // false Use typeof for simple built in types: ‘example … Read more
When using instanceof, you need to know the class of B at compile time. When using isAssignableFrom() it can be dynamic and change during runtime.
Have you tried the __name__ attribute of the class? ie type(x).__name__ will give you the name of the class, which I think is what you want. >>> import itertools >>> x = itertools.count(0) >>> type(x).__name__ ‘count’ If you’re still using Python 2, note that the above method works with new-style classes only (in Python 3+ … Read more