What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
Which of the following is a falsy value in JavaScript?
A). 0
B).
C). null
D). All of the above
Which method can be used to convert a string to a number in JavaScript?
A). parseInt()
B). toString()
C). toNumber()
D). parseStr()
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
What is the result of typeof undefined?
A). undefined
B). null
C). object
D). number
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
How do you declare a variable with an undefined value?
A). let x;
B). let x = '';
C). let x = 0;
D). let x = null;
Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean