What does the typeof operator return for an undefined variable?
A). undefined
B). number
C). boolean
D). string
What does typeof window.evaluate evaluate to in JavaScript?
A). function
B). object
C). string
D). undefined
What is the result of typeof undefined in JavaScript?
A). undefined
B). string
C). null
D). object
What does typeof Math evaluate to in JavaScript?
A). math
B). object
C). number
D). undefined
How does JavaScript evaluate Boolean(0)?
A). 1
B). 0
C). null
D). undefined
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 typeof true evaluate to in JavaScript?
A). boolean
B). number
C). string
D). undefined
What does Number('123') return in JavaScript?
A). 123
B). '123'
C). NaN
D). 1
What will be the output of [] instanceof Array in JavaScript?
A). 1
B). 0
C). null
D). undefined
What is the result of typeof NaN in JavaScript?
A). number
B). NaN
C). undefined
D). string