What does the expression typeof null return in JavaScript?
A). number
B). string
C). object
D). boolean
Which data type represents variables that have been explicitly set to have no value?
A). Number
B). Undefined
C). String
D). Null
How is the Symbol data type different from other primitive data types in JavaScript?
A). Symbols can be used as object keys
B). Symbols can be compared directly
C). Symbols can be used in mathematical operations
D). Symbols can be concatenated with strings
What is the result of the expression typeof undefined in JavaScript?
A). number
B). string
C). undefined
D). boolean
Which primitive data type represents variables that have been explicitly set to represent no value?
A). Number
B). String
C). Undefined
D). Null
Which data type is represented by the value null in JavaScript?
A). Numeric data
B). Textual data
C). Absence of value
D). Logical value
Which primitive data type represents variables that are declared but not initialized?
A). Number
B). String
C). Undefined
D). Null
What does the expression typeof true return in JavaScript?
A). number
B). string
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 unique identifiers introduced in ECMAScript 6?
A). Number
B). Symbol
C). Boolean
D). Undefined