What is the output of typeof null?
A). null
B). undefined
C). object
D). number
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
Which function can convert a number to a string in JavaScript?
A). toString()
B). parseInt()
C). String()
D). Number()
What is the result of null == undefined?
A). 1
B). 0
C). Error
D). NaN
What is the result of typeof undefined?
A). undefined
B). null
C). object
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;
What is the data type of true in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list