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JavaScript for Beginners: Make a Web Page Actually Do Something
Check Yourself: Before You Write Code
Five scenario questions on what JavaScript does and where it runs. If you miss more than one, go back to the first two lessons before moving on.
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Before You Write Code
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What JavaScript Actually Does in Your Browser
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Running JavaScript in the Console and in a Script File
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The Basics You Cannot Skip
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JavaScript let, const, and Why Not var
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JavaScript Data Types and typeof
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JavaScript == vs ===: Comparing Values Without Surprises
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Making Decisions and Repeating Work
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JavaScript if, else and the Ternary Operator
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JavaScript Loops: for, for...of and while
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Organizing Your Code
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JavaScript Functions and Arrow Functions
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JavaScript Arrays and Objects
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Touching the Page
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Changing the Page With the JavaScript DOM
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JavaScript Click and Form Events
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Reading JavaScript Errors in the Browser Console
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- Final Check: JavaScript for Beginners
1.
A friend says "I'll learn Java first, since it's the same as JavaScript." What do you tell them?
2.
A site checks "you must be 18" only in browser JavaScript before letting someone order. What's the problem?
3.
You put an API key in script.js because "nobody reads .js files". Is it safe?
4.
You typed 2 + 3 in the console and saw 5. You put the same line in script.js and the console shows nothing. Why?
5.
You changed script.js, saved it, and the page still shows the old behaviour. What should you try first?
About
Five scenario questions on what JavaScript does and where it runs. If you miss more than one, go back to the first two lessons before moving on.
- Duration
- 5 min
- Last update
- 09/02/2026
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