JavaScript Multiple-Choice Quiz

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

• let x = 10;

• var x = 10;

• const x = 10;

• All of the above

Which symbol is used for single-line comments in JavaScript?

• /* comment */

• // comment

• # comment

• -- comment

What will typeof null return?

• "null"

• "undefined"

• "object"

• "string"

Which function is used to print something in the console?

• print()

• log()

• console.log()

• write()

What is the result of "5" + 3 in JavaScript?

• 8

• 53

• 35

• Error

Which keyword is used to define a constant variable?

• var

• let

• const

• define

How do you write an IF statement in JavaScript?

• if x = 5 then {}

• if (x == 5) {}

• if x == 5 {}

• if x === 5 then {}

What will Boolean("false") return?

• true

• false

• null

• undefined

What does NaN stand for?

• Not a Null

• Not a Number

• No assigned Number

• Null and None

Which operator is used to compare both value and type?

• ==

• ===

• !=

• !==