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improve solution to second exercise

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- create new function to search substrings
- update PROGRESS.md
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Reality Enjoyer
2026-01-16 07:20:40 +00:00
parent 0b910bf74d
commit f55039411e
2 changed files with 46 additions and 17 deletions
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PROGRESS.md
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@@ -37,6 +37,7 @@
- [ ] Wallet Module Structure (crypto)
### Milestone 5: Chapters 8-9 (Collections, Error Handling)
- [x] Vec Statistics Calculator (Vec, HashMap, basic math) - 2026-01-15
- [ ] Contact Manager (HashMap, Option, Result)
- [ ] Log Parser (Vec, filtering, file handling)
- [ ] Transaction Pool/Mempool (crypto)
@@ -58,7 +59,9 @@
- [ ] Async HTTP, JSON parsing
## Reflections
*Space for learning insights and "aha" moments*
### 2026-01-15 - Vec Statistics Exercise
**Key Learning:** Type conversion and ownership struggles are normal! Spent 45min wrestling with `usize` vs `i32` vs `f64` for vector length, and dealing with moved values when iterating multiple times. The compiler suggestions led to complex generics at first, but simpler `as f64` casting solved the type issues. HashMap frequency counting clicked once the ownership issues were resolved. **Insight:** "Terrible but working" code is a valid first step - iterate to clean it up.
---
*This file tracks overall learning journey and milestone completion*