Javascript Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to Javascript Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is a valid type of function javascript supports?

A - named function

B - anonymous function

C - Both of the above.

D - None of the above.

Answer : C

Explanation

A function in JavaScript can be either named or anonymous.

Q 3 - Which of the following type of variable takes precedence over other if names are same?

A - global variable

B - local variable

C - Both of the above.

D - None of the above.

Answer : B

Explanation

A local variable takes precedence over a global variable with the same name.

Q 4 - Which built-in method sorts the elements of an array?

A - changeOrder(order)

B - order()

C - sort()

D - None of the above.

Answer : C

Explanation

sort() method sorts the elements of an array.

Q 5 - Which of the following function of String object returns the character at the specified index?

A - charAt()

B - charCodeAt()

C - concat()

D - indexOf()

Answer : A

Explanation

charAt() − Returns the character at the specified index.

Q 6 - Which of the following function of String object returns the characters in a string between two indexes into the string?

A - slice()

B - split()

C - substr()

D - substring()

Answer : D

Explanation

substring() − Returns the characters in a string between two indexes into the string.

Q 7 - Which of the following function of String object returns the primitive value of the specified object.

A - toLocaleUpperCase()

B - toUpperCase()

C - toString()

D - valueOf()

Answer : D

Explanation

valueOf() − Returns the primitive value of the specified object.

Q 8 - Which of the following function of Array object returns a new array comprised of this array joined with other array(s) and/or value(s)?

A - concat()

B - pop()

C - push()

D - some()

Answer : A

Explanation

concat() − Returns a new array comprised of this array joined with other array(s) and/or value(s).

Q 9 - Which of the following function of Array object applies a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value?

A - pop()

B - push()

C - reduce()

D - reduceRight()

Answer : C

Explanation

reduce() − Applies a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value.

Q 10 - Which of the following function of Array object applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value?

A - pop()

B - push()

C - reduce()

D - reduceRight()

Answer : D

Explanation

reduceRight() − Applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value.

javascript_questions_answers.htm
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