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Updated: 2026年5月31日
Create Object
Original task (JA): オブジェクト
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Conclusion
Create Object — free browser-based JavaScript practice
Why it matters in real projects
オブジェクトは{}で囲み、キーと値のペアで定義します。 Similar patterns appear daily in code review and production UI work.Step-by-step workflow
1. Read the guide and understand the goal of "Create Object" 2. Review the JavaScript editor pane and start from the starter code 3. Open hints if stuck; compare your diff with the sample solution 4. Click Run and inspect preview/console output 5. Auto-check looks for output containing: const user, name, age. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
オブジェクトは{}で囲み、キーと値のペアで定義します。Technical focus
Key CSS properties: name, age.Hint before you peek at the solution
const user = { name: '太郎', age: 20 };Sample solution walkthrough
JavaScript APIs used: console.log. Verify spelling and async/await usage. Explanation: オブジェクトは{}で囲み、キーと値のペアで定義します。 Hint recap: const user = { name: '太郎', age: 20 };Solution code
📝 Sample code
const user = { name: '太郎', age: 20 };
console.log(user);Common mistakes for this exact task
・Skipping the hint: const user = { name: '太郎', age: 20 };Troubleshooting
Q: Preview does not change after Run A: Ensure you edited the JavaScript pane and clicked Run. Q: Looks correct but check fails A: Auto-check looks for output containing: const user, name, age. Look for typos, full-width spaces, or unclosed tags. Q: Console shows errors A: Open DevTools Console and fix bracket/quote mismatches at the reported line. Q: Hard to type on mobile A: Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.Interview / portfolio tips
・Explain the techniques in "Create Object" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Connect this task to a real component you would ship ・Discuss CSS properties: name, age ・Describe when you use: console.logWhat to do after you pass
Move to the next exercise in the js-basic track, then continue the learning roadmap at /en/learning/js-basic/.Keywords
Free hands-on exercise covering オブジェクト, js-basic, 入門, name, age, console.log, create object—search-friendly guide for Create Object.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
userというオブジェクトにnameとageを入れて、console.logで出力してください。値は自由です。
Hint if stuck
const user = { name: '太郎', age: 20 };