⚡ Bolt: [performance improvement] Replace Array.includes with Set in filters for O(N) lookups

[xb1g]

💡 What: Replaced Array.prototype.includes with Set.prototype.has within .filter() loops across three files (app/api/classrooms/[id]/grading/route.ts, app/api/assignments/[id]/nodes/route.ts, and components/teams/StudentTeamDashboard.tsx).

🎯 Why: Using .includes() inside a .filter() loop results in an O(N * M) time complexity because for every item in the filtered array, the code scans the entire target array. By pre-computing a Set, the lookup becomes O(1), improving the overall operation to O(N + M). This is a classic Bolt optimization pattern.

📊 Impact: Reduces time complexity of array differences from O(N^2) to O(N). The exact real-world impact depends on the array size, but this avoids potentially severe bottlenecks as the application scales and classrooms/teams/assignments grow larger.

🔬 Measurement: Run pnpm test and ESLINT_USE_FLAT_CONFIG=false npx eslint to verify no regressions were introduced.

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PR created automatically by Jules for task 18138056828062593602 started by @xb1g

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Project	Deployment	Actions	Updated (UTC)
pseed	Error		Mar 23, 2026 3:58am

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[Copilot]

Pull request overview

This PR applies a small performance optimization by replacing repeated Array.includes(...) membership checks inside .filter() loops with precomputed Set lookups (Set.has(...)). This reduces the time complexity of “difference” style filters from O(N·M) to O(N+M) in a few potentially hot paths (API routes and a dashboard component).

Changes:

• components/teams/StudentTeamDashboard.tsx: Precompute a Set of the user’s team IDs for faster “available teams” filtering.
• app/api/classrooms/[id]/grading/route.ts: Use a Set of submission user IDs to efficiently find classroom members missing from submissions.
• app/api/assignments/[id]/nodes/route.ts: Use a Set of existing node IDs to efficiently detect missing node IDs.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
components/teams/StudentTeamDashboard.tsx	Uses a Set for faster team membership checks when filtering available teams.
app/api/classrooms/[id]/grading/route.ts	Uses a Set to speed up finding missing user IDs between classroom members and submission users.
app/api/assignments/[id]/nodes/route.ts	Uses a Set to speed up detecting missing node IDs before inserting assignment nodes.

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	web	7723b06	May 11 2026, 06:36 PM