JavaScript MCQs with answers Page - 138

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 property gives the number of elements in an array?

  • (A) length
  • (B) size
  • (C) count
  • (D) total

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Q. Which method removes the last element from an array?

  • (A) pop()
  • (B) push()
  • (C) shift()
  • (D) unshift()

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Q. What is the result of null == undefined?

  • (A) true
  • (B) false
  • (C) NaN
  • (D) Error

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Q. What is the output of typeof null?

  • (A) object
  • (B) null
  • (C) undefined
  • (D) string

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Q. Which method combines two or more arrays?

  • (A) concat()
  • (B) merge()
  • (C) append()
  • (D) combine()

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Q. How do you check if an object has a specific property?

  • (A) hasOwnProperty()
  • (B) contains()
  • (C) includes()
  • (D) exists()

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Q. What does the 'new' keyword do?

  • (A) Creates a new instance of an object
  • (B) Declares a variable
  • (C) Creates a new array
  • (D) Defines a new function

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Q. Which statement is used to exit a function early?

  • (A) return
  • (B) exit
  • (C) stop
  • (D) break

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Q. What does a JavaScript Promise represent?

  • (A) An eventual completion or failure of an asynchronous operation
  • (B) A synchronous operation
  • (C) An event listener
  • (D) A new thread

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Q. What is the default state of a JavaScript Promise?

  • (A) pending
  • (B) fulfilled
  • (C) rejected
  • (D) resolved

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