Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
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 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the data type of true in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the result of null === undefined?
A). 1
B). 0
C). Error
D). NaN
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
What is the result of typeof undefined?
A). undefined
B). null
C). object
D). number
What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
What is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined