What does the typeof operator return for an undefined variable?
A). undefined
B). number
C). boolean
D). string
What is the output of typeof function(){} in JavaScript?
A). function
B). object
C). undefined
D). null
What is the result of typeof undefined in JavaScript?
A). undefined
B). string
C). null
D). object
What does typeof new Date() evaluate to in JavaScript?
A). date
B). object
C). string
D). null
What is the output of typeof Symbol('id') in JavaScript?
A). symbol
B). object
C). string
D). null
How does the instanceof operator work in JavaScript?
A). Checks if an object has a specific prototype in its prototype chain.
B). Checks if two variables are of the same type.
C). Checks if a variable is null.
D). Checks if a variable is undefined.
What does Number('123') return in JavaScript?
A). 123
B). '123'
C). NaN
D). 1
What does typeof window.evaluate evaluate to in JavaScript?
A). function
B). object
C). string
D). undefined
What will be the output of typeof {} in JavaScript?
A). object
B). array
C). null
D). undefined
What is the result of typeof NaN in JavaScript?
A). number
B). NaN
C). undefined
D). string