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
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What does it mean that JavaScript is dynamically typed?
A). Variables do not have types
B). Variables can change type
C). Variables must be declared with a type
D). Variables cannot change type
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 is the type of the value returned by JSON.parse('null')?
A). null
B). string
C). object
D). undefined
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
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 is the type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined