feat: add flippy bird web game

[wbopan]

Summary

• add static Flippy Bird-style game using HTML5 canvas

Testing

• npm test
• npm run lint
• npm run typecheck

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https://chatgpt.com/codex/tasks/task_e_6895cd7444188332b9bb219ce7dc1bd0

[claude]

Claude finished @wbopan's task —— View job

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PR Review: Flippy Bird Web Game

I've completed a comprehensive review of the added Flappy Bird game. Here's my detailed feedback:

Review Checklist:

• Read and analyze the flippy-bird.html file
• Evaluate code quality and best practices
• Check for potential bugs or issues
• Assess performance considerations
• Review security concerns
• Evaluate test coverage implications
• Provide constructive feedback and recommendations

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Code Quality & Best Practices ✅

Strengths:

• Clean, readable HTML5 Canvas implementation
• Proper semantic HTML structure with appropriate meta tags
• Consistent code formatting and logical organization
• Efficient game loop using requestAnimationFrame()

Minor Improvements:

• Consider extracting magic numbers into named constants at the top:

  const BIRD_SIZE = 30;
  const BIRD_START_X = 20;
  const BIRD_START_Y = 150;
  const PIPE_SPEED = 2;

Potential Bugs & Issues 🔍

Critical Issue - Score Logic Bug (Line 87-89):

pipes.forEach(p => {
  if (p.x + pipeWidth === 20) score++; // Exact equality check
});

This will likely never trigger because p.x + pipeWidth may never exactly equal 20 due to floating-point arithmetic. Should use a range check:

if (p.x + pipeWidth <= 20 && p.x + pipeWidth >= 18) score++;

Minor Issues:

• Collision detection uses hardcoded bird position (20, birdY) but should reference actual bird dimensions
• No pause/resume functionality - game continues running even when browser tab is inactive

Performance Considerations ⚡

Good Performance Practices:

• Using requestAnimationFrame() for smooth animation
• Efficient pipe cleanup when pipes move off-screen
• Minimal DOM manipulation

Potential Optimizations:

• Consider using ctx.clearRect() instead of filling entire canvas each frame
• Bird and pipe rendering could be optimized with sprite images for better visual quality

Security Concerns 🔒

Assessment: Low Risk ✅

• Pure client-side HTML/JS with no external dependencies
• No user input handling beyond click events
• No data persistence or network requests
• No eval() or dynamic code execution

This is a safe, self-contained static game file.

Test Coverage 📋

Current State:

• No automated tests for the game logic
• Manual testing appears to have been done (per PR description)

Recommendations:

• Consider adding unit tests for core game functions (collision detection, scoring, reset logic)
• Example test structure:

  // Test collision detection logic
  // Test score increment logic  
  // Test bird physics (gravity, jump)
  // Test pipe generation

File Placement & Project Integration 🏗️

Good:

• Appropriate placement in public/ directory for static assets
• Self-contained file requiring no build process

Consider:

• Adding a link to this game from the main application (if applicable)
• Including game controls/instructions in the UI

Overall Assessment ⭐

This is a solid implementation of a Flappy Bird-style game with clean, readable code. The main concern is the scoring bug that should be addressed before merging.

Recommended Actions:

1. Fix the scoring logic bug (critical)
2. Extract magic numbers to constants (nice-to-have)
3. Consider adding basic tests for game logic (future enhancement)

The code follows good practices and poses no security risks. Great work on creating a functional game in just 101 lines!

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