FnQuiz

01:12

JavaScript functions

90 seconds. One radio per question. Options are shuffled in the live test; this screen is the review after Check.

Checked · 12 seconds left

80%

8 of 10 · 2 wrong picks marked below

Retake test

1. Which keyword declares a constant?

   • var
   • const
   • let
   • static

2. Which method adds an item to the end of an array?

   • unshift()
   • pop()
   • push()
   • shift()

3. Which operator checks strict equality?

   • ==
   • ===
   • =
   • !=

4. Which function parses a JSON string?

   • JSON.stringify()
   • JSON.parse()
   • parseInt()
   • eval()

   Your pick is red. Green is the right option.

5. Which method selects an element by id?

   • document.getElementById()
   • document.querySelectorAll()
   • document.getElementsByClassName()
   • window.find()

6. Which keyword declares a function (classic)?

   • method
   • function
   • def
   • proc

7. Which method joins array items into a string?

   • split()
   • concat()
   • join()
   • slice()

8. Which method runs a function after a delay?

   • setTimeout()
   • setInterval()
   • requestAnimationFrame()
   • sleep()

9. Which method removes the last array element?

   • shift()
   • pop()
   • splice()
   • delete()

10. Which keyword starts an error handler?

    • catch
    • try
    • throw
    • finally

    Your pick is red. Green is the right option.