How is the Undefined data type different from the Null data type in JavaScript?
A). Undefined represents an intentional absence of value
B). Null represents variables not initialized
C). Undefined is used for object keys
D). Null is used for mathematical operations
Which primitive data type represents variables that have been explicitly set to represent no value?
A). Number
B). String
C). Undefined
D). Null
What does the expression typeof 42 return in JavaScript?
A). number
B). string
C). undefined
D). boolean
Which primitive data type represents unique identifiers introduced in ECMAScript 6?
A). Number
B). Symbol
C). Boolean
D). Undefined
Which of the following statements accurately describes the Boolean data type in JavaScript?
A). It represents textual data
B). It represents numeric data
C). It represents logical values
D). It represents an absence of value
Which primitive data type represents textual data?
A). Number
B). String
C). Boolean
D). Undefined
Which primitive data type in JavaScript represents integers and floating-point numbers?
A). Number
B). String
C). Boolean
D). Undefined
Which data type represents variables that have been explicitly set to have no value?
A). Number
B). Undefined
C). String
D). Null
What does the expression typeof '123' return in JavaScript?
A). number
B). string
C). undefined
D). boolean
Which primitive data type represents variables that are declared but not initialized?
A). Number
B). String
C). Undefined
D). Null