JavaScript MCQs with answers Page - 55

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. Which method of the iterable object returns an iterator object for the collection?

  • (A) iterator()
  • (B) _iteration_()
  • (C) _iterator_()
  • (D) _return_iterator_()

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Q. Consider the following code snippet

Code: 
let succ = function(x) x+1, yes = function() true, no = function() false;
  • (A) Functional behaviour
  • (B) Modular behaviour
  • (C) No convenience
  • (D) Shorthand expression

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Q. Consider the following code snippet

Code: 
data.sort(function(a,b),b-a);
  • (A) Sort in the alphabetical order
  • (B) Sort in the chronological order
  • (C) Sort in reverse alphabetical order
  • (D) Sort in reverse numerical order

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Q. Which is the correct code that returns a complex number that is the complex conjugate of this one?

  • (A) Complex.prototype.conj = function() { return new Complex(this.r, -this.i); };
  • (B) Complex.prototype.conj = function() { return Complex(this.r, -this.i); };
  • (C) Complex.prototype.conj = function() { return (this.r, -this.i); };
  • (D) Complex.prototype.conj = function() { new Complex(this.r, -this.i); };

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Q. How can we make methods available on all objects?

  • (A) Object.add(methods)
  • (B) Object.methods(add)
  • (C) Object.add.methods(…)
  • (D) Object.prototype

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Q. What is the procedure to add methods to HTMLElement so that they will be inherited by the objects that represent the HTML tags in the current document?

  • (A) HTMLElement.prototype
  • (B) HTMLElement.prototype(…)
  • (C) HTML.elements(add)
  • (D) HTML.addmethods()

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Q. You can refresh the webpage in JavaScript by using

  • (A) window.reload
  • (B) location.reload
  • (C) window.refresh
  • (D) page.refresh

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Q. The functions provide() and require() of Dojo toolkit and Google’s Closure library are used for

  • (A) declaring and loading modules
  • (B) loading and declaring modules
  • (C) declaring modules
  • (D) none of these

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Q. What is the object that is in TOP of the root in JavaScript?

  • (A) url
  • (B) top
  • (C) window
  • (D) document

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Q. How to insert a comment on several lines?

  • (A) //This comment has more than one line //
  • (B) /* This comment has more than one line */
  • (C) Any of them
  • (D) Both of them

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