Which of the following is not a valid JavaScript variable name according to naming conventions?
A). myVariable
B). _myVariable
C). 2ndVariable
D). MyVariable
What data type is used to represent a collection of key-value pairs in JavaScript?
A). Object
B). Array
C). Map
D). Set
What will be the output of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Object
What will be the output of typeof {} in JavaScript?
A). Object
B). Null
C). Undefined
D). Boolean
Which data type is used to represent the absence of a value in JavaScript?
A). Null
B). Undefined
C). NaN
D). Boolean
What is the data type of the value NaN in JavaScript?
A). Null
B). String
C). Number
D). Boolean
Which of the following is not a valid JavaScript data type?
A). Integer
B). Object
C). Symbol
D). NaN
What will be the output of typeof NaN in JavaScript?
A). String
B). Number
C). NaN
D). Undefined
Which data type is used to represent a list of elements in JavaScript?
A). List
B). Array
C). Tuple
D). Set
Which symbol is used to denote a comment in JavaScript?
A). //
B). --
C). #
D). /* ... */