batman questions

• Why are generics said to be invariant when "? extends Klass" is allowed?
• Generics type parameters getting bounded, without passing real type
• Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node
• How to unit test a function, which just calls other functions?
• What are the different ways of writing an IIFE? What are their use cases?
• How does the getClass() is implemented in java?
• When does the binary operators execution happen in Java?
• 32 OR 64 BIT for the JVM?
• onClick doesn't render new react component.
• What's the meaning of /gi in a regex? [duplicate]

batman answers