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 is the default value of a variable in JavaScript if it is not initialized?
A). null
B). undefined
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 result of the expression true + false in JavaScript?
A). true
B). false
C). 1
D). 0
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
What does the Symbol data type represent in JavaScript?
A). A unique identifier
B). A number
C). A boolean value
D). An object
What is the data type of the value NaN in JavaScript?
A). Number
B). String
C). Object
D). Undefined
Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false
Which of the following statements is true about primitive data types in JavaScript?
A). They have methods and properties
B). They can be used as keys in objects
C). They are instances of Object
D). They are passed by value
What happens when you add two numbers using the + operator in JavaScript?
A). The numbers are concatenated
B). The numbers are multiplied
C). The numbers are added
D). An error occurs
Which primitive value represents absence of value or no value assigned?
A). undefined
B). null
C). 0
D). 'undefined'