What is the initial type of a variable declared with let a;?

What does the isNaN function do?

A). Checks if a value is not a number

B). Converts a value to a number

C). Checks if a value is a number

D). Converts a value to NaN

What is the result of typeof [] in JavaScript?

A). array

B). object

C). list

D). undefined

Which type conversion happens automatically in the expression 3 + '5'?

A). Number to String

B). String to Number

C). Boolean to String

D). Number to Boolean

What will be the result of typeof function() {} in JavaScript?

A). function

B). object

C). undefined

D). method

What does the parseInt function do in JavaScript?

A). Converts a number to a string

B). Converts a string to an integer

C). Converts a boolean to a number

D). Converts an array to a number

Given the code: let y = 10; y = true;, what is the type of y after execution?

A). number

B). boolean

C). string

D). object

What is the type of the value returned by JSON.parse('null')?

A). null

B). string

C). object

D). undefined

Which operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

What will be the result of the following code: let z = '123'; z = Number(z); console.log(typeof z);?

A). string

B). number

C). undefined

D). boolean

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object