Calculator questions

Calculator answers

• Lifetimes' handling when returning inner reference from a reference passed as an argument to the function
• How can I use lambda expressions in a Comparator class in Java
• Java8 - idiomatic way to process a Stream<Callable<...>> in parallel delivering to a non-thread-safe consumer?
• Class type of reference and the actual class type, which decides which method to call? [duplicate]
• How can I implement a function differently depending on if a generic type implements a trait or not?
• How to convert an Object to enum to use it in a switch statment
• Python find numbers between range in list or array
• When an immutable reference to a mutable reference to a value outside the scope is returned, why is the mutable reference dropped when the scope ends?
• Implement something similar to C++'s `std::remove_reference` in Rust?
• Java 8 Streams: Collapse/abstract streams parts