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'
What is the data type of the value undefined in JavaScript?
A). String
B). Object
C). Undefined
D). Number
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
What is the result of the expression true == 1 in JavaScript?
A). true
B). false
C). Error
D). 1
Which of the following is a valid JavaScript symbol?
A). symbol
B). &symbol
C). #symbol
D). Symbol('description')
Which of the following is not a primitive value in JavaScript?
A). Number
B). Boolean
C). Object
D). String
What is a primitive value in JavaScript?
A). A complex data structure
B). A basic data type
C). A function
D). An array
What is the result of the expression 5 + '5' in JavaScript?
A). 10
B). '55'
C). '10'
D). Error
Which of the following statements about primitive values in JavaScript is true?
A). They are mutable
B). They are passed by reference
C). They are stored on the heap
D). They are immutable
Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false