What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
What is the output of typeof null?
A). null
B). undefined
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 result of null == undefined?
A). 1
B). 0
C). Error
D). NaN
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
What is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined
What is the data type of true in JavaScript?
A). String
B). Boolean
C). Number
D). Object