How C++ Knowledge Still Pays Off in 2026: 1-Day Python JSON Job Done in 5 Minutes
srchvrs · x · 2026-09-03
A concrete case for why C++ knowledge still matters in the vibe-coding era: post-processing a huge JSON file in Python was estimated at over a day, so the author vibe-coded a C++ post-processor using RapidJSON that finished in under 5 minutes, with outputs verified identical.
Takeaways:
- The key is knowing performance gaps: C++/Rust/Java can run 100x faster than Python, worth switching on large tasks
- Surprisingly, the RapidJSON C++ code was more compact than the Python version
- Lesson for vibe-coding: AI makes code easy, but language knowledge tells you which tool to reach for and how to verify correctness
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