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 typeof window.evaluate evaluate to in JavaScript?
A). function
B). object
C). string
D). undefined
What does typeof new Date() evaluate to in JavaScript?
A). date
B). object
C). string
D). null
What will be the output of typeof {} in JavaScript?
A). object
B). array
C). null
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
How does JavaScript evaluate typeof /^regex$/ in JavaScript?
A). regexp
B). object
C). string
D). null
What is the output of typeof function(){} in JavaScript?
A). function
B). object
C). undefined
D). null
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
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 is the result of Boolean('false') in JavaScript?
A). 1
B). 0
C). NaN
D). null