JavaScript MCQs with answers Page - 40

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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A

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Q. Variable declared is example of ___________ Variable.

Code: 
function message() {
var name = "Bench";
alert(name);
}
  • (A) Local
  • (B) Global
  • (C) Semi-Global
  • (D) None of the above

A

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Q. What is the output for code A and B?

Code: 
Code A:
var x = 10;
y = --x + 1;
alert(y);

Code B:
var x = 10;
y = x-- + 1;
alert(y);
  • (A) 11,11
  • (B) 11,10
  • (C) 10,11
  • (D) 10,10

A

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Q. A _________ is a group of reusable code which can be called anywhere in your program.

  • (A) switch
  • (B) loop
  • (C) function
  • (D) exception

A

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Q. The most common way to define a function in JavaScript is by using the ____________ keyword.

  • (A) define
  • (B) function
  • (C) var
  • (D) fun

A

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Q. Which statement required if you want to return a value from a function?

  • (A) return
  • (B) loop
  • (C) break
  • (D) continue

A

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Q. The Function() constructor expects ______ number of string arguments

  • (A) 0
  • (B) 1
  • (C) 2
  • (D) any

A

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Q. Which among the following regular expression specifies that password should contain at least one capital letter or one digit.

  • (A) /.*[A-Z].*/.test(password) && /.*[0-9].*/.test(password)
  • (B) /.*[A-Z].*/.test(password) || /.*[0-9].*/.test(password)
  • (C) /.*[A-Z][0-9].*/.test(password)
  • (D) None of the above

A

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Q. Which of the following string will match the RegEx "((d).(dd))$"?

  • (A) 2.2
  • (B) 223.12
  • (C) 22.123
  • (D) 223.123

A

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Q. Consider the following JavaScript statement containing regular expressions and check if the pattern matches?

Code: 
var text = "lestfindcourse: 1, 2, 3";
var pattern = /d+/g;
  • (A) pattern.test(text)
  • (B) text.test(pattern)
  • (C) text.equals(pattern)
  • (D) text==pattern

A

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Q. What would be the result of the following statement in JavaScript using regular expression methods?

  • (A) Throws an exception
  • (B) Returns [1,2,3,4,5,6,7,8,9]
  • (C) Returns ["123","456","789"]
  • (D) Returns ["123""456""789"]

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