Answer & Solution
Answer: Option B
Solution:
typeof undefined returns 'undefined'.
Q
What is the result of typeof undefined in JavaScript?
Related Questions on Average
What does the typeof operator return for an undefined variable?
A). undefined
B). number
C). boolean
D). string
How does JavaScript evaluate Boolean(0)?
A). 1
B). 0
C). null
D). undefined
What is the result of Boolean('false') in JavaScript?
A). 1
B). 0
C). NaN
D). null
What is the output of typeof function(){} in JavaScript?
A). function
B). object
C). undefined
D). null
What is the output of typeof Symbol('id') in JavaScript?
A). symbol
B). object
C). string
D). null
What does typeof Math evaluate to in JavaScript?
A). math
B). object
C). number
D). undefined
What does typeof true evaluate to in JavaScript?
A). boolean
B). number
C). string
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.
How does the instanceof operator behave with primitive values in JavaScript?
A). Throws an error
B). Returns true for all primitive values
C). Returns false for all primitive values
D). Primitive values cannot be used with instanceof
What will be the output of typeof null in JavaScript?
A). object
B). null
C). undefined
D). string