Answer & Solution
Answer: Option A
Solution:
Symbols are unique and immutable values introduced in ES6.
Q
Which data type represents unique and immutable values in JavaScript introduced in ES6?
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Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
What is the data type of the value 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?
A). '5'
B). 5
C). '10'
D). 10
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What will be the result of typeof 'hello' in JavaScript?
A). String
B). Number
C). Undefined
D). Function
What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String
Which operator checks if an object is an instance of a specific object type in JavaScript?
A). instanceof
B). typeof
C). isInstanceof
D). isTypeOf