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JavaScript for Beginners: Make a Web Page Actually Do Something
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JavaScript for Beginners: Make a Web Page Actually Do Something

Final Check: JavaScript for Beginners

Fifteen scenario questions across the whole course. If you get twelve or more right, you're ready for JavaScript Intermediate.

15 min JavaScriptProgramming BasicsWeb DevelopmentTesting and Debugging Beginner
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1. What is JavaScript's job on a web page, compared with HTML and CSS?
Structure. Looks. Behaviour: what happens when someone clicks, types or submits.
2. Which of these can browser JavaScript be trusted to enforce?
A minimum order amount. A password check. None of them. It can help the visitor, but the server has to check anything that matters.
3. Where should the script tag go in a beginner page?
Just before </body>, so the elements exist when the script runs. At the very top, before <html>. Inside the <title>.
4. You'll need a running total that changes in a loop. How do you declare it?
const total = 0; inside the loop. let total = 0; before the loop. var total; anywhere.
5. What does typeof null return?
"null" "object", an old bug. Check null with value === null. "undefined"
6. Which value is truthy?
0 "" "0"
7. What does 0 == "" give, and what does 0 === "" give?
true, then false. false, then false. true, then true.
8. You have an if, else if, else chain. How many of its blocks can run for one value?
All of the ones whose condition is true. One: the first one whose condition is true, or the else. None, unless there's an else.
9. What does break do inside a loop?
Skips to the next round. Leaves the loop immediately. Restarts the loop.
10. What is the difference between a parameter and an argument?
The parameter is the name in the function definition. The argument is the value you pass when you call it. They're two names for the return value. Parameters are for arrow functions only.
11. items is ["rice", "eggs", "coffee"]. What is items[items.length - 1]?
undefined "coffee" "rice"
12. Which is the better way to show a different look when an order is paid?
element.style for every colour, border and font. status.classList.add("paid") with the look in CSS. Replace the whole page with innerHTML.
13. Which event should you listen for to handle a form being sent?
click on the submit button submit on the form load on the window
14. "Uncaught TypeError: Cannot read properties of undefined (reading 'name')" points at cart[3].name. Most likely cause?
cart has fewer than four items, so cart[3] is undefined. name is a reserved word. The cart is const.
15. An error appears in the console from a file called content.js that you didn't write. What do you do first?
Rewrite your script. Test in an Incognito or Private window, where most extensions are off. Ignore every error from now on.

About

Fifteen scenario questions across the whole course. If you get twelve or more right, you're ready for JavaScript Intermediate.

Duration
15 min
Last update
08/28/2026
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