Classes in JavaScript MCQ

Test your knowledge with important Classes in JavaScript MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Classes in JavaScript MCQs at Bissoy

• The method that can be used to create new properties and also to modify the attributes of existing properties is _________
  ক

  Object.defineProperty()

  খ

  Object.defineProperties()

  গ

  Both Object.defineProperty() and Object.defineProperties()

  ঘ

  Object.inherit()
• The snippet that filters the filtered set is __________
  ক

  var t=new FilteredSet(s, {function(s) {return !(x instanceof Set);});

  খ

  var t=new FilteredSet{function(s) {return !(x instanceof Set);});

  গ

  var t=new FilteredSet(s, {function(s) {return (x instanceof Set);});

  ঘ

  var t=new FilteredSet(s, {function(s) {return x;});
• If A is the superclass and B is the subclass, then subclass inheriting the superclass can be represented as _________
  ক

  B=inherit(A);

  খ

  B=A.inherit();

  গ

  B.prototype=inherit(A);

  ঘ

  B.prototype=inherit(A.prototype);
• When a class B can extend another class A, we say that?
  ক

  A is the superclass and B is the subclass

  খ

  B is the superclass and A is the subclass

  গ

  Both A and B are the superclass

  ঘ

  Both A and B are the subclass
• The property of JSON() method is __________
  ক

  it can be invoked manually as object.JSON()

  খ

  it will be automatically invoked by the compiler

  গ

  it is invoked automatically by the JSON.stringify() method

  ঘ

  it cannot be invoked in any form
• The meaning for Augmenting classes is that ___________
  ক

  objects inherit prototype properties even in a dynamic state

  খ

  objects inherit prototype properties only in a dynamic state

  গ

  objects inherit prototype properties in the static state

  ঘ

  object doesn’t inherit prototype properties in the static state
• The basic difference between JavaScript and Java is _________
  ক

  There is no difference

  খ

  Functions are considered as fields

  গ

  Variables are specific

  ঘ

  Functions are values, and there is no hard distinction between methods and fields
• The keyword or the property that you use to refer to an object through which they were invoked is _________
  ক

  from

  খ

  to

  গ

  this

  ঘ

  object
• The behaviour of the instances present of a class inside a method is defined by __________
  ক

  Method

  খ

  Classes

  গ

  Interfaces

  ঘ

  Classes and Interfaces