Answer & Solution
Answer: Option C
Solution:
JavaScript performs implicit type conversion, treating undefined as NaN and null as 0 when adding them.
Q
What is the result of the expression undefined + null in JavaScript?
Related Questions on Average
What happens when you try to access a variable that has not been declared in JavaScript?
A). SyntaxError is thrown
B). ReferenceError is thrown
C). TypeError is thrown
D). Undefined
Which of the following statements is true about JavaScript's null value?
A). It represents an empty string
B). It represents a non-existent value
C). It represents a boolean value
D). It represents a number
What is the result of the expression true == 1 in JavaScript?
A). true
B). false
C). Error
D). 1
What is the result of the expression true + false in JavaScript?
A). true
B). false
C). 1
D). 0
Which of the following is not a primitive value in JavaScript?
A). Number
B). Boolean
C). Object
D). String
Which primitive value represents absence of value or no value assigned?
A). undefined
B). null
C). 0
D). 'undefined'
Which of the following is a valid way to represent the value null in JavaScript?
A). undefined
B). NULL
C). null
D). None of the above
What is the default value of a variable in JavaScript if it is not initialized?
A). null
B). undefined
C). 0
D). 'undefined'
What is the data type of the value undefined in JavaScript?
A). String
B). Object
C). Undefined
D). Number
What is the data type of the value NaN in JavaScript?
A). Number
B). String
C). Object
D). Undefined