💡 An editor is ready below the article—experiment freely!
Updated: 2026年5月31日
Object Property
Original task (JA): オブジェクトのプロパティ
📌
Conclusion
Object Property — free browser-based JavaScript practice
Why it matters in real projects
ドット記法でオブジェクトのプロパティにアクセスします。 Similar patterns appear daily in code review and production UI work.Step-by-step workflow
1. Read the guide and understand the goal of "Object Property" 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: 花子. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
ドット記法でオブジェクトのプロパティにアクセスします。Technical focus
Key CSS properties: name, age.Hint before you peek at the solution
user.name または user['name']Sample solution walkthrough
JavaScript APIs used: console.log. Verify spelling and async/await usage. Explanation: ドット記法でオブジェクトのプロパティにアクセスします。 Hint recap: user.name または user['name']Solution code
📝 Sample code
const user = { name: '花子', age: 25 };
console.log(user.name);Common mistakes for this exact task
・Skipping the hint: user.name または user['name']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: 花子. 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 "Object Property" 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 オブジェクトのプロパティ, js-basic, 初級, name, age, console.log, object property—search-friendly guide for Object Property.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
userオブジェクトのnameをconsole.logで出力してください。
Hint if stuck
user.name または user['name']