What is the result of typeof [] in JavaScript?

How can you check if a variable is an array in JavaScript?

A). typeof variable === 'array'

B). Array.isArray(variable)

C). variable instanceof array

D). variable.constructor === array

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 will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object

What happens when you add a number and a string in JavaScript?

A). An error is thrown

B). The number is converted to a string

C). The string is converted to a number

D). Both are converted to boolean

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

A). null

B). number

C). undefined

D). object

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

What will typeof null return in JavaScript?

A). null

B). undefined

C). object

D). number

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

A). typeof

B). instanceof

C). type

D). isType

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

A). null

B). string

C). object

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