Which of the following is a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String
What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?
A). '105'
B). 105
C). 15
D). '15'
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
What will let x = null; console.log(typeof x); output in JavaScript?
A). Object
B). Null
C). Undefined
D). Number
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
Which data type represents unique and immutable values in JavaScript introduced in ES6?
A). Symbol
B). Object
C). Array
D). Function
What will be the result of typeof 'hello' in JavaScript?
A). String
B). Number
C). Undefined
D). Function
What is the data type of the value 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Null