Javascript Quizz

Which of the following is the correct syntax to print a message in the console in JavaScript?

• console.print("Hello World")

• print.console("Hello World")

• console.log("Hello World")

• log.console("Hello World")

Which of the following data types is NOT primitive in JavaScript?

• String

• Boolean

• Object

• Number

What does typeof null return in JavaScript?

• null

• object

• undefined

• number

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

• <!--

• /*

• //

• #

Which method converts a JSON string into a JavaScript object?

• JSON.toObject()

• JSON.parse()

• JSON.stringify()

• JSON.convert()

What will Boolean(0) return?

• true

• false

Which operator is used to compare both value and type in JavaScript?

• ==

• =

• ===

• !==

What will the following code output? console.log("5" + 3);

• 8

• 53

• Error

• Nan

How do you declare a constant in JavaScript?

• constant x = 5;

• let x = 5;

• const x = 5;

• var x = 5;
  

What will typeof NaN return?

• number

• Nan

• undefined

• object