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Clear filters== compares primitives by value and objects by reference (whether they are the exact same object), while equals() compares the logical content of two objects when the class overrides it.
this is decided by how a function is called, not where it is written: as a method it is the object before the dot, with new it is the new object, and arrow functions inherit it from the enclosing scope.
An abstract class can hold state, constructors and partial implementation but a class can inherit only one, while an interface defines a contract that a class can implement many of.
An abstract class can have instance fields, constructors and a mix of implemented and abstract methods but supports only single inheritance, while an interface defines a contract that a class can implement multiple times and, since Java 8, can include default methods.
A classmethod receives the class as its first argument (cls) and can create or configure instances, while a staticmethod receives no automatic argument and is just a function placed inside the class namespace.
In JavaScript every object has an internal link to another object called its prototype, and property lookups walk up this prototype chain until the property is found or the chain ends.