Add Sherlock and Divisors HackerRank solution with interactive visualization#306
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📝 WalkthroughSummary by CodeRabbitリリースノート
Walkthrough新規のインタラクティブHTMLページとJupyterノートブックを追加し、偶数約数を数えるPython実装と複数のSVG/Reactベース視覚化（ステップ再生・図解・コード表示・複雑度・エッジケース・FAQ）を導入。サイトのインデックスも更新。 Changes
Sequence Diagram(s)sequenceDiagram
participant User as User
participant UI as Browser UI (React)
participant Stepper as Stepper Controller
participant Viz as SVG Visuals
participant Code as CodeBlock (Prism/Copy)
User->>UI: 入力 n を指定 / セクション選択
UI->>Stepper: makeSteps(n) を生成
Stepper->>Viz: 現在ステップ情報を送信
Viz-->>UI: 描画更新 (SVG アニメーション)
Stepper->>Code: コードスニペット表示/強調（該当行）
User->>Stepper: 再生 / 次へ / 前へ / リセット操作
Stepper->>Viz: ステップ遷移イベントを発行
Viz-->>UI: 状態更新（結果表示、マッピング可視化）
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45分 Possibly related PRs
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Actionable comments posted: 5
♻️ Duplicate comments (1)
public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html (1)
1243-1251: ソースファイルと同一の入力値上限未設定の問題があります。ソース HTML で指摘した通り、
apply()にv >= 1のみのバリデーションでは巨大な n 入力時にブラウザがフリーズします。ビルド元のソースファイル側で修正すれば、この public 版にも反映されるはずです。🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 1243 - 1251, The apply() handler currently only checks v >= 1, allowing very large inputs that freeze the browser; modify apply() to enforce an upper bound (e.g. define a MAX_N constant) and reject or clamp values > MAX_N before calling setN, setSteps(makeSteps(v)), setCur, and setPlay; reference the apply function and variables edit, setN, makeSteps and ensure you either show a user error/validation when v > MAX_N or clamp v to MAX_N so makeSteps is never invoked with an unbounded huge n.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 396-414: The table row for n=36 incorrectly labels "完全平方 m=18";
update that cell to indicate that n is a perfect square and use the correct
square root—replace the string "完全平方 m=18" with something like "n が完全平方（m=6）" or
"完全平方 n=36 (m=6)" in the table cell for the row where the first column is "36".
- Around line 7-9: The HTML currently loads the development React bundles via
the script tags referencing react.development.js and react-dom.development.js;
for production replace those with the production minified bundles
(react.production.min.js and react-dom.production.min.js) so the page uses the
smaller, optimized React builds—update the script src references in the same
block that currently points to
"https://unpkg.com/react@18/umd/react.development.js" and
"https://unpkg.com/react-dom@18/umd/react-dom.development.js" to the
corresponding production URLs (and keep the Babel include only for development
if needed).
- Around line 1243-1251: The apply() handler currently only checks v >= 1 and
allows arbitrarily large n which can freeze the browser because makeSteps calls
computeDivisors for n and for m; add an upper bound check in apply() (e.g.,
compare v against a defined MAX_N constant) and reject or clamp values above
that limit before calling setN/setSteps/setCur/setPlay; update UI feedback
(e.g., show an error/message or disable the Apply action) when v > MAX_N to
prevent makeSteps/computeDivisors from running on huge inputs (refer to apply(),
setN, setSteps, makeSteps, computeDivisors).
- Around line 471-482: The copyCode function calls navigator.clipboard.writeText
without handling rejected Promises; wrap the clipboard write in a Promise catch
(or convert to async/await and use try/catch) to handle failures and avoid
unhandled rejections, and update the UI accordingly (use the existing copyBtn
element to show an error state/text and remove it after a timeout) while still
preserving the success flow that updates copyBtn and toggles the 'copied' class;
reference function copyCode and elements with IDs 'codeBlock' and 'copyBtn'.
In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 7-10: Replace the development builds referenced in the HTML by
swapping the script src entries for "/vendor/react/react.development.js",
"/vendor/react-dom/react-dom.development.js", "/vendor/babel/babel.min.js", and
"/vendor/tailwindcss/script.js" with their production/minified counterparts (or
place production files into vendor and update these srcs), and ensure the build
pipeline emits those production files; additionally, unify asset origins by
either copying Prism's theme CSS and JS (currently loaded from
cdnjs.cloudflare.com) into the same /vendor/ directory and updating their links,
or switch all vendor scripts to CDN equivalents so React/Babel/Tailwind and
Prism are consistently loaded from the same source.
---
Duplicate comments:
In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 1243-1251: The apply() handler currently only checks v >= 1,
allowing very large inputs that freeze the browser; modify apply() to enforce an
upper bound (e.g. define a MAX_N constant) and reject or clamp values > MAX_N
before calling setN, setSteps(makeSteps(v)), setCur, and setPlay; reference the
apply function and variables edit, setN, makeSteps and ensure you either show a
user error/validation when v > MAX_N or clamp v to MAX_N so makeSteps is never
invoked with an unbounded huge n.
ℹ️ Review info
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (4)
Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlMathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.ipynbpublic/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/index.html
Contributor
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 1459-1462: The set notation on the right-hand side of the mapping
φ: d → d/2 is malformed: replace the incorrect string "{' {k|k|(n/2)} '}" with a
proper predicate form such as "{k | k divides n/2}" (i.e., the set of k with k |
(n/2)) so the mapping reads φ: d → d/2 from "{d | d|n, 2|d}" to "{k | k divides
n/2}".
- Around line 2071-2078: Replace the innerHTML concatenation around
getElementById('main-nav') so you build the anchors with DOM APIs instead of
template literals: iterate over the labels/ids arrays, create an A element for
each via document.createElement('a'), set a.href = `#${ids[i]}`, set a.className
and a.style.fontFamily (or use a.classList) and set a.textContent = labels[i],
then append each anchor to nav (clearing nav first). Do the same replacement for
the matching pattern found in the public/ copy of this file.
ℹ️ Review info
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (4)
Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlMathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.ipynbpublic/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/index.html
- Fix misleading table label: '完全平方 m=18' → '完全平方 n=36（√n=6）' - Switch React from development to production minified bundles - Add MAX_N (10M) upper bound check in apply() with validation UI - Add .catch() error handling to copyCode() clipboard write - Unify public file Prism assets from CDN to local /vendor/ paths - Copy prism-python.min.js to public/vendor/prismjs/components/
Contributor
There was a problem hiding this comment.
Actionable comments posted: 2
♻️ Duplicate comments (5)
Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html (2)
2095-2102:innerHTMLをtextContent+ DOM API に置き換えてください前回レビューで指摘済み。現在
labels/idsはハードコードのため即時の XSS リスクは低いですが、プロジェクトのコーディングガイドラインに違反しています。Based on learnings, "HTML template generation must usetextContentand DOM API instead ofinnerHTMLto prevent XSS vulnerabilities"（public/*.htmlに適用）。🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 2095 - 2102, Replace the use of innerHTML on the element retrieved by getElementById('main-nav') — currently set via labels.map(...).join('') — with DOM API element creation and textContent to avoid HTML injection: for each label/id in labels/ids create an <a> element via document.createElement('a'), set its href to `#${ids[i]}`, set its className/style attributes, assign the visible label via textContent (not innerHTML), and append each anchor to nav; remove the map(...).join('') pattern and the innerHTML assignment.
1483-1486: 集合表記{'{k|k|(n/2)}'}が不正確前回レビューで指摘済み。述語形式として
{k>0:k|(n/2)}のように正しい表記に修正してください。🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 1483 - 1486, The set notation for the image of the map φ (φ: d → d/2) is incorrect; replace the incorrect literal "{k|k|(n/2)}" with a proper predicate-style set comprehension such as "{k>0 : k | (n/2)}" (or the equivalent "{k \mid k>0, k \mid (n/2)}") wherever the JSX fragment uses the code node containing "{' {k|k|(n/2)} '}", ensuring the change appears inside the <code className="dm text-xs"> element paired with the φ mapping.public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html (3)
2095-2102:innerHTMLをtextContent+ DOM API に置き換えてください前回レビューで指摘済み。
public/*.htmlに対してはコーディングガイドラインで明示的にtextContentと DOM API の使用が要求されています。Based on learnings, "HTML template generation must usetextContentand DOM API instead ofinnerHTMLto prevent XSS vulnerabilities"。🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 2095 - 2102, Replace the innerHTML assembly (nav.innerHTML = labels.map(...).join('')) with DOM API creation: clear the element (nav.textContent = ''), iterate labels and for each index create an <a> using document.createElement, set its href using ids[i], set className/attributes/style as needed, assign the visible label to anchor.textContent (not innerHTML), and append each anchor to nav; use the existing variables nav, labels and ids and mirror the same classes/styles from the template when setting attributes.
15-22: Prism アセットの取得元が CDN とローカルで混在しているLine 16 のテーマ CSS と Lines 466-468 の JS は CDN（
cdnjs.cloudflare.com）から読み込んでいますが、Line 20 の line-numbers CSS は/vendor/からローカル読み込みです。React/Babel/Tailwind はすべてローカルに統一されているため、Prism も同様にローカルまたは CDN のいずれかに統一すべきです。オフライン動作やキャッシュ戦略の一貫性に影響します。Also applies to: 466-468
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 15 - 22, The Prism assets are mixed between CDN and local sources: the theme CSS link href "https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css" is loaded from CDN while the line-numbers CSS link href "/vendor/prismjs/plugins/line-numbers/prism-line-numbers.css" (and the Prism JS at the CDN URLs referenced around lines 466-468) are local/CDN-mixed; pick one source and make all Prism assets consistent—either replace the CDN theme and JS links with local equivalents under /vendor/prismjs/ or update the local /vendor/prismjs line-numbers.css (and any local JS) to use the CDN URLs—ensure you update the href/src attributes for the theme CSS, line-numbers CSS, and Prism JS script tags so all three reference the same origin.
1483-1486: 集合表記{'{k|k|(n/2)}'}が不正確ソースファイルと同一の問題。前回レビューで指摘済みです。
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 1483 - 1486, The set-builder notation on the right side of the map φ: d → d/2 is malformed; replace the string "{k|k|(n/2)}" with a clear builder like "{k | k divides (n/2)}" (or "{k | k ∣ (n/2)}") so the mapping φ: {d | d ∣ n, 2 ∣ d} → {k | k ∣ (n/2)} reads correctly; update the JSX/HTML fragment that renders the code (the element containing the text "{' {k|k|(n/2)} '}") to use the corrected notation.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 1318-1340: The preset buttons' onClick handler (inside the
presets.map) doesn't clear validation errors, so add a call to setErr('')
alongside the existing state updates (setEdit, setSteps(makeSteps(v)), setN,
setCur, setPlay) to ensure any existing error message is cleared when a preset
is selected; update the onClick block where those setters are invoked to include
setErr('').
In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 1318-1340: The preset buttons' onClick handler doesn't clear
existing error state; update the handler inside the presets.map (the button
callback that currently calls setEdit, setSteps, setN, setCur, setPlay) to also
call setErr('') so any previous error is reset when a preset is selected.
---
Duplicate comments:
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 2095-2102: Replace the use of innerHTML on the element retrieved
by getElementById('main-nav') — currently set via labels.map(...).join('') —
with DOM API element creation and textContent to avoid HTML injection: for each
label/id in labels/ids create an <a> element via document.createElement('a'),
set its href to `#${ids[i]}`, set its className/style attributes, assign the
visible label via textContent (not innerHTML), and append each anchor to nav;
remove the map(...).join('') pattern and the innerHTML assignment.
- Around line 1483-1486: The set notation for the image of the map φ (φ: d →
d/2) is incorrect; replace the incorrect literal "{k|k|(n/2)}" with a proper
predicate-style set comprehension such as "{k>0 : k | (n/2)}" (or the equivalent
"{k \mid k>0, k \mid (n/2)}") wherever the JSX fragment uses the code node
containing "{' {k|k|(n/2)} '}", ensuring the change appears inside the <code
className="dm text-xs"> element paired with the φ mapping.
In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 2095-2102: Replace the innerHTML assembly (nav.innerHTML =
labels.map(...).join('')) with DOM API creation: clear the element
(nav.textContent = ''), iterate labels and for each index create an <a> using
document.createElement, set its href using ids[i], set
className/attributes/style as needed, assign the visible label to
anchor.textContent (not innerHTML), and append each anchor to nav; use the
existing variables nav, labels and ids and mirror the same classes/styles from
the template when setting attributes.
- Around line 15-22: The Prism assets are mixed between CDN and local sources:
the theme CSS link href
"https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css"
is loaded from CDN while the line-numbers CSS link href
"/vendor/prismjs/plugins/line-numbers/prism-line-numbers.css" (and the Prism JS
at the CDN URLs referenced around lines 466-468) are local/CDN-mixed; pick one
source and make all Prism assets consistent—either replace the CDN theme and JS
links with local equivalents under /vendor/prismjs/ or update the local
/vendor/prismjs line-numbers.css (and any local JS) to use the CDN URLs—ensure
you update the href/src attributes for the theme CSS, line-numbers CSS, and
Prism JS script tags so all three reference the same origin.
- Around line 1483-1486: The set-builder notation on the right side of the map
φ: d → d/2 is malformed; replace the string "{k|k|(n/2)}" with a clear builder
like "{k | k divides (n/2)}" (or "{k | k ∣ (n/2)}") so the mapping φ: {d | d ∣
n, 2 ∣ d} → {k | k ∣ (n/2)} reads correctly; update the JSX/HTML fragment that
renders the code (the element containing the text "{' {k|k|(n/2)} '}") to use
the corrected notation.
ℹ️ Review info
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
⛔ Files ignored due to path filters (1)
public/vendor/prismjs/components/prism-python.min.jsis excluded by!**/*.min.js
📒 Files selected for processing (3)
Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/index.html
…visors
- Fix set notation: {k|k|(n/2)} → { k | k∣(n/2) } (and left-hand side)
- Replace nav.innerHTML template literals with DOM createElement/textContent
- Add setErr('') to preset button onClick handlers to clear validation state
- Fix public file: Prism theme CSS CDN → /vendor/prismjs/themes/prism-tomorrow.min.css
Contributor
There was a problem hiding this comment.
Actionable comments posted: 2
♻️ Duplicate comments (1)
public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html (1)
16-17:⚠️ Potential issue | 🟠 Major公開ファイルで Prism の参照が CDN に戻っており、アセット方針が再び不一致です。
Line 7-10 は
/vendor/ですが、Line 16-17 と Line 466-468 が CDN のままです。公開物の再現性・運用一貫性のため、Prism も/vendor/に統一してください。修正案
-<link - href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css" - rel="stylesheet" -/> +<link + href="https://github.com/vendor/prismjs/themes/prism-tomorrow.min.css" + rel="stylesheet" +/> -<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js"></script> -<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-python.min.js"></script> -<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/plugins/line-numbers/prism-line-numbers.min.js"></script> +<script src="https://github.com/vendor/prismjs/prism.min.js"></script> +<script src="https://github.com/vendor/prismjs/components/prism-python.min.js"></script> +<script src="https://github.com/vendor/prismjs/plugins/line-numbers/prism-line-numbers.min.js"></script>Also applies to: 466-468
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and Divisors/Sherlock_and_Divisors.html around lines 16 - 17, Replace the CDN Prism references with the local /vendor/ copies to match the other vendor links: locate the link tag whose href equals "https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css" and any script tags sourcing "https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js" or plugin files, and update their href/src to the corresponding /vendor/prism/... paths so all Prism assets use the local vendor directory (keep filenames identical to the CDN versions).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 456-461: The FAQ paragraph (Q4) claims n up to 10¹² is feasible,
which contradicts the implemented input cap MAX_N (value 10,000,000) enforced in
the validation block around MAX_N; update the FAQ text to reflect the actual
supported limit (use MAX_N or 10,000,000) and adjust the performance estimate
accordingly (e.g., show √(MAX_N/2) steps) so the user-facing explanation matches
the implementation and any references near the FAQ and the MAX_N validation are
consistent.
- Around line 471-493: The copyCode() function currently assumes
navigator.clipboard and its writeText method exist, which can throw in
unsupported contexts; add a guard before calling navigator.clipboard.writeText:
check if navigator.clipboard and typeof navigator.clipboard.writeText ===
'function', and if not immediately update the UI (the element referenced by
copyBtn) to show a friendly failure or fallback; if available, call
writeText(c).then(...).catch(...) as before. Use the existing DOM references
(codeBlock, copyBtn) and ensure the fallback path mirrors the error UI
(textContent 'Failed' and class 'copied') so users get immediate feedback in
non-Clipboard-API environments.
---
Duplicate comments:
In `@public/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html:
- Around line 16-17: Replace the CDN Prism references with the local /vendor/
copies to match the other vendor links: locate the link tag whose href equals
"https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css"
and any script tags sourcing
"https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js" or plugin
files, and update their href/src to the corresponding /vendor/prism/... paths so
all Prism assets use the local vendor directory (keep filenames identical to the
CDN versions).
ℹ️ Review info
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (3)
Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.htmlpublic/index.html
Comment on lines
+456
to
+461
| Q4. 非常に大きな n でも動作するか？ | ||
| </p> | ||
| <p class="text-slate-600 text-sm"> | ||
| Python の int は任意精度整数なので桁あふれはありません。n=10¹² でも | ||
| √(n/2)≈7×10⁵ ステップ程度です。 | ||
| </p> |
Contributor
There was a problem hiding this comment.
FAQ の「大きな n」の説明が実装上限と矛盾しています。
Line 459-460 では n=10¹² でも動作可能と読めますが、Line 1263-1265 で MAX_N=10,000,000 超は拒否されています。ユーザー向け説明を上限仕様に合わせてください。
Also applies to: 1247-1266
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html around lines 456 - 461, The FAQ paragraph
(Q4) claims n up to 10¹² is feasible, which contradicts the implemented input
cap MAX_N (value 10,000,000) enforced in the validation block around MAX_N;
update the FAQ text to reflect the actual supported limit (use MAX_N or
10,000,000) and adjust the performance estimate accordingly (e.g., show
√(MAX_N/2) steps) so the user-facing explanation matches the implementation and
any references near the FAQ and the MAX_N validation are consistent.
Comment on lines
+471
to
+493
| function copyCode() { | ||
| var c = document.getElementById('codeBlock').textContent; | ||
| navigator.clipboard | ||
| .writeText(c) | ||
| .then(function () { | ||
| var b = document.getElementById('copyBtn'); | ||
| b.textContent = 'Copied!'; | ||
| b.classList.add('copied'); | ||
| setTimeout(function () { | ||
| b.textContent = 'Copy'; | ||
| b.classList.remove('copied'); | ||
| }, 2000); | ||
| }) | ||
| .catch(function () { | ||
| var b = document.getElementById('copyBtn'); | ||
| b.textContent = 'Failed'; | ||
| b.classList.add('copied'); | ||
| setTimeout(function () { | ||
| b.textContent = 'Copy'; | ||
| b.classList.remove('copied'); | ||
| }, 2000); | ||
| }); | ||
| } |
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🧩 Analysis chain
🏁 Script executed:
find . -type f -name "Sherlock_and_Divisors.html" | head -20Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 292
🏁 Script executed:
wc -l "./Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html"Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 191
🏁 Script executed:
sed -n '471,493p' "./Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html"Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 1132
🏁 Script executed:
sed -n '456,461p' "./Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html"Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 353
🏁 Script executed:
sed -n '1247,1265p' "./Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html"Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 915
🏁 Script executed:
sed -n '2097,2107p' "./Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html"Repository: myoshi2891/Algorithm-DataStructures-Math-SQL
Length of output: 774
🌐 Web query:
navigator.clipboard undefined synchronous error exception handling JavaScript
💡 Result:
navigator.clipboard being undefined is not something you can “catch” with try/catch, because it usually fails before any Promise exists (you’re accessing a missing property). Handle it with feature-detection, then handle async failures with await ... try/catch (or .catch()).
1) Avoid the synchronous “undefined” error (feature-detect first)
function hasAsyncClipboard() {
return typeof navigator !== "undefined" && !!navigator.clipboard?.writeText;
}
async function copy(text) {
if (!hasAsyncClipboard()) {
// Common causes: not a secure context (HTTP/file), iframe without allow, older browser
throw new Error("Async Clipboard API unavailable (navigator.clipboard is undefined).");
}
await navigator.clipboard.writeText(text);
}navigator.clipboard may be missing in insecure contexts (HTTP / file://) and in some embedded contexts like iframes without permission. (codestudy.net)
2) Catch the real runtime failures (Promise rejection)
Most Clipboard API failures are async (permission/user gesture/focus), so wrap the await:
async function safeCopy(text) {
try {
if (!navigator.clipboard?.writeText) return { ok: false, reason: "unavailable" };
await navigator.clipboard.writeText(text); // must be in a user gesture in many browsers
return { ok: true };
} catch (err) {
// NotAllowedError is common (no gesture, denied permission, document not focused, etc.)
return { ok: false, reason: err?.name || "error", err };
}
}writeText() is async and should be handled with try/catch around await (or .catch). (web.dev)
“Document is not focused” / NotAllowedError is a common rejection scenario. (stackoverflow.com)
3) Reading is especially variable (Firefox note)
Even when navigator.clipboard exists, readText() may be missing or restricted in Firefox in typical web pages, leading to “not a function”. (stackoverflow.com)
Practical checklist
- Ensure HTTPS (or true secure context like
localhost). (codestudy.net) - Call clipboard methods inside a user gesture (e.g., click handler). (stackoverflow.com)
- Use feature detection for
navigator.clipboard/readText/writeText, and treat failures as Promise rejections. (web.dev)
Citations:
- 1: https://www.codestudy.net/blog/navigator-clipboard-is-undefined/?utm_source=openai
- 2: https://web.dev/articles/async-clipboard?utm_source=openai
- 3: https://stackoverflow.com/questions/56306153/domexception-on-calling-navigator-clipboard-readtext?utm_source=openai
- 4: https://stackoverflow.com/questions/78062109/firefox-navigator-clipboard-readtext-is-not-a-function?utm_source=openai
- 5: https://www.codestudy.net/blog/navigator-clipboard-is-undefined/?utm_source=openai
- 6: https://stackoverflow.com/questions/57868405/safari-clipboard-error-typeerror-undefined-is-not-an-object?utm_source=openai
- 7: https://web.dev/articles/async-clipboard?utm_source=openai
copyCode() で Clipboard API 非対応時の可用性チェックを追加してください。
Line 473-474 で navigator.clipboard にアクセスする際、当該 API が無い環境（非セキュアコンテキストや未対応ブラウザなど）では、navigator.clipboard が undefined となり、直接プロパティアクセスで同期エラーが発生します。この場合、Promise の .catch() に到達しないため、ユーザーに何のフィードバックも返りません。writeText 呼び出し前に可用性チェックを入れ、明示的にエラーハンドリングしてください。
修正案
function copyCode() {
var c = document.getElementById('codeBlock').textContent;
+ var b = document.getElementById('copyBtn');
+ if (!navigator.clipboard || !window.isSecureContext) {
+ b.textContent = 'Failed';
+ b.classList.add('copied');
+ setTimeout(function () {
+ b.textContent = 'Copy';
+ b.classList.remove('copied');
+ }, 2000);
+ return;
+ }
navigator.clipboard
.writeText(c)
.then(function () {
- var b = document.getElementById('copyBtn');
b.textContent = 'Copied!';
b.classList.add('copied');
setTimeout(function () {
b.textContent = 'Copy';
b.classList.remove('copied');
}, 2000);
})
.catch(function () {
- var b = document.getElementById('copyBtn');
b.textContent = 'Failed';
b.classList.add('copied');
setTimeout(function () {
b.textContent = 'Copy';
b.classList.remove('copied');
}, 2000);
});
}🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock` and
Divisors/Sherlock_and_Divisors.html around lines 471 - 493, The copyCode()
function currently assumes navigator.clipboard and its writeText method exist,
which can throw in unsupported contexts; add a guard before calling
navigator.clipboard.writeText: check if navigator.clipboard and typeof
navigator.clipboard.writeText === 'function', and if not immediately update the
UI (the element referenced by copyBtn) to show a friendly failure or fallback;
if available, call writeText(c).then(...).catch(...) as before. Use the existing
DOM references (codeBlock, copyBtn) and ensure the fallback path mirrors the
error UI (textContent 'Failed' and class 'copied') so users get immediate
feedback in non-Clipboard-API environments.
Contributor
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🧩 Analysis chain
@myoshi2891 承知しました。この指摘事項をイシューとして作成します。
🏁 Script executed:
#!/bin/bash
# Create GitHub issue for Clipboard API availability check
gh issue create \
--repo myoshi2891/Algorithm-DataStructures-Math-SQL \
--title "Clipboard API 非対応環境での copyCode() 可用性チェック追加" \
--body "## 概要
Sherlock_and_Divisors.html の \`copyCode()\` 関数で、Clipboard API が利用できない環境（非セキュアコンテキストや未対応ブラウザなど）において、\`navigator.clipboard\` が \`undefined\` となり同期エラーが発生する問題があります。
## 対象ファイル
\`Mathematics/Fundamentals/HackerRank/Claude/Easy/Sherlock and Divisors/Sherlock_and_Divisors.html\`
Lines: 471-493
## 問題点
- \`navigator.clipboard\` にアクセスする際、当該 API が無い環境では同期エラーが発生
- Promise の \`.catch()\` に到達しないため、ユーザーへのフィードバックが返らない
- \`writeText\` 呼び出し前の可用性チェックが不足
## 対応内容
\`navigator.clipboard\` および \`window.isSecureContext\` の存在チェックを追加し、利用不可時には明示的にエラーハンドリングを行うよう改善する必要があります。
## 関連情報
- PR: https://github.com/myoshi2891/Algorithm-DataStructures-Math-SQL/pull/306
- コメント: https://github.com/myoshi2891/Algorithm-DataStructures-Math-SQL/pull/306#discussion_r2852280013
- 報告者: `@myoshi2891`" \
--assignee myoshi2891
Length of output: 74
@myoshi2891 イシューを作成しました:
Issue #307: Clipboard API 非対応環境での copyCode() 可用性チェック追加
対象ファイルと問題点、対応内容を記載し、このPRとコメントへのバックリンクを含めました。
This was referenced Feb 25, 2026
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コミット内容：
Sherlock_and_Divisors.html(リネームおよび新規追加)Sherlock_and_Divisors.ipynb(新規追加)public/index.html(メンテナンスツールにより自動更新)全5件のコードレビュー指摘を検証し、すべて修正してコミットしました（
56401ce）。全4件の指摘を現在のコードで検証し、全て有効と確認の上で修正・コミットしました（
b4ed835）。