What is the initial type of a variable declared with let a;?
A). null
B). number
C). undefined
D). object
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 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
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 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 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 be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What is the type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined