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Updated: 2026年5月31日
Api Loading State
Original task (JA): 読み込み中表示
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Conclusion
Api Loading State — free browser-based JavaScript practice
Why it matters in real projects
非同期処理では、処理の順序を意識してログを出します。 Similar patterns appear daily in code review and production UI work.Step-by-step workflow
1. Read the guide and understand the goal of "Api Loading State" 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: 読み込み中, 完了. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
非同期処理では、処理の順序を意識してログを出します。Technical focus
Key CSS properties: https.Hint before you peek at the solution
最初に読み込み中、awaitの後に完了Sample solution walkthrough
JavaScript APIs used: console.log, fetch(, async , await . Verify spelling and async/await usage. Explanation: 非同期処理では、処理の順序を意識してログを出します。 Hint recap: 最初に読み込み中、awaitの後に完了Solution code
📝 Sample code
async function run() {
console.log('読み込み中');
const res = await fetch('https://jsonplaceholder.typicode.com/posts/1');
const data = await res.json();
console.log('完了', data.title);
}
run();Common mistakes for this exact task
・Skipping the hint: 最初に読み込み中、awaitの後に完了 ・Forgetting await res.json() leaves you with a Promise objectTroubleshooting
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: 読み込み中, 完了. 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 "Api Loading State" 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: https ・Describe when you use: console.log, fetch(, asyncWhat to do after you pass
Move to the next exercise in the api track, then continue the learning roadmap at /en/learning/api/.Keywords
Free hands-on exercise covering 読み込み中表示, api, 上級, https, console.log, fetch(, async , await , api loading state—search-friendly guide for Api Loading State.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
fetchの前に「読み込み中」、成功後に「完了」をconsole.logで出力してください。
Hint if stuck
最初に読み込み中、awaitの後に完了