Question

To define each of the set classes as a property of the sets object (namespace) for the module, the statement is (a) sets = sets.AbstractEnumerableSet.extend(); (b) sets.SingletonSet = sets.AbstractEnumerableSet.extend(…); (c) sets.SingletonSet = sets.extend(…); (d) sets = sets.extend(…); This question was posed to me during a job interview. The origin of the question is Modules in JavaScript topic in portion Classes and Modules in JavaScript of JavaScript Select the correct answer from above options JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

The correct answer is (b) sets.SingletonSet = sets.AbstractEnumerableSet.extend(…); To explain I would say: Singleton is an object which can only be instantiated once. The extend keyword is used in class declarations or class expressions to create a class which is a child of another class. The sets object is the namespace for the module, and we define each of the set classes as a property of this object.