JS-QUIZ

Which keyword is used to declare a variable in JavaScript?

• var

• let

• const

• All of the above

What does typeof null return?

• null

• object

• undefined

• string

Which method is used to convert a string into an array?

• arrayify()

• slice()

• join()

• split()

How do you write a single-line comment in JavaScript?

• // comment
  

• <!-- comment -->

• /* comment */

• # comment

What will 2 + "2" evaluate to in JavaScript?

• 4

• 22

• undefined

• NaN

Which function is used to parse a string into an integer?

• parseInt()

• parseFloat()

• Number()

• toInt()

What does NaN stand for?

• No Argument Needed
  

• Not a Number

• Number at Null

• Non-Accessible Node

Which loop always executes at least once?

• for

• while

• do...while

• None

What is the output of console.log(0.1 + 0.2 === 0.3)?

• true

• false

• undefined

• NaN

What is the correct way to declare a function in JavaScript?

• function myFunc() {}

• def myFunc() {}

• let myFunc = {}

• create function myFunc() {}