⚡️ Speed up method Color.as_hex by 10%

[codeflash-ai]

📄 10% (0.10x) speedup for Color.as_hex in pydantic/color.py

⏱️ Runtime : 20.9 microseconds → 19.0 microseconds (best of 115 runs)

📝 Explanation and details

To optimize the given Python program for faster execution, we can make a few improvements.

1. Avoid Repeated Function Calls in Loop: Instead of calling float_to_255 in each iteration of the list comprehension, move it outside the loop when possible.
2. Use String Concatenation Efficiently: Use join efficiently over multiple steps.
3. Cache Commonly Used Values: If applicable, store frequently used or calculated values for reuse.
4. Short-Circuit Conditions: Evaluate the most common conditions first for faster exit.

Here is the optimized version of the provided code.

Explanation:

• Loop Optimization: Pre-calculated alpha value is directly accessed and then added to the values list if it exists, reducing duplicated list slicing.
• Efficient String Concatenation: Combined loop inside join operation rather than two-step concatenation which improves performance slightly.
• Short-circuit the repeat_vehicle check: Use slicing directly inside join.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	✅ 18 Passed
🌀 Generated Regression Tests	🔘 None Found
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

⚙️ Existing Unit Tests Details

- codeflash_concolic_3rkoed57/tmp0zbro6s3/test_concolic_coverage.py
- test_color.py

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