JavaScript MCQs with answers Page - 53

Here, you will find a collection of MCQ questions on JavaScript. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. The meaning for Augmenting classes is that

  • (A) objects inherit prototype properties even in dynamic state
  • (B) objects inherit prototype properties only in dynamic state
  • (C) objects inherit prototype properties in static state
  • (D) None of these

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Q. Consider the following code snippet :

Code: 
var o = new F();
o.constructor === F
  • (A) false
  • (B) true
  • (C) 0
  • (D) 1

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Q. Which of the following is an example to perform the most common XML manipulations using the XML objects invocation?

  • (A) insertChildBefore()
  • (B) insertChildAfter()
  • (C) appendChildAfter(…)
  • (D) appendChildBefore(…)

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Q. What is the code required to delete all “weight” tags?

  • (A) delete weight(pt).all;
  • (B) delete pt.element[all];
  • (C) delete pt;
  • (D) delete pt..weight;

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Q. The property of JSON() method is

  • (A) it can be invoked manually as object.JSON()
  • (B) it will be automatically invoked by the compiler
  • (C) it is invoked automatically by the JSON.stringify() method
  • (D) it cannot be invoked in any form

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Q. When a class B can extend another class A, we say that

  • (A) A is the superclass and B is the subclass
  • (B) B is the superclass and A is the subclass
  • (C) Both A and B are the superclass
  • (D) Both A and B are the subclass

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Q. The method that can be used to create new properties and also to modify the attributes of existing properties is

  • (A) Both Object.defineProperty() and Object.defineProperties()
  • (B) Object.defineProperties()
  • (C) Object.defineProperty()
  • (D) None

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Q. The snippet that filters the filtered set is

  • (A) var t=new FilteredSet(s, {function(s) {return !(x instanceof Set);});
  • (B) var t=new FilteredSet{function(s) {return !(x instanceof Set);});
  • (C) var t=new FilteredSet(s, {function(s) {return (x instanceof Set);});
  • (D) var t=new FilteredSet(s, {function(s) {return x;});

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Q. If A is the superclass and B is the subclass, then subclass inherting the superclass can be represented as

  • (A) B=inherit(A);
  • (B) B=A.inherit();
  • (C) B.prototype=inherit(A);
  • (D) B.prototype=inherit(A.prototype);

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Q. What is the code to be used to trim whitespaces ?

  • (A) let trimmed = (l.trim() for (l in lines));
  • (B) let trimmed = (trim(l));
  • (C) let trimmed = l.trim();
  • (D) let trimmed = for(l in lines));

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