# Learning Progress Log

## Setup Phase
**Date:** 2026-01-12
**Activity:** Created learning scaffolding and multi-chat system
**Key Insight:** Need structured approach to maintain context across multiple Claude chats

## Book Progress
- ✅ Chapters 1-3: Basics, Variables, Functions, Control Flow
- ✅ Chapter 4: Ownership, Borrowing, Slices
- ✅ Chapters 5-6: Structs, Enums, Pattern Matching
- ✅ Chapter 7: Modules
- ✅ Chapter 8: Collections
- ⏳ Chapter 9: Error Handling

## Exercise Completion Log
*Will be updated as exercises are completed*

### Milestone 1: Chapters 1-3 (Basics)
- [ ] Temperature Converter CLI
- [ ] FizzBuzz with Customization
- [ ] Base58 Encoder/Decoder (crypto)

### Milestone 2: Chapter 4 (Ownership)
- [ ] String Manipulator
- [ ] Array Analyzer
- [ ] Simple Hash Visualizer (crypto)

### Milestone 3: Chapters 5-6 (Structs/Enums)
- [ ] Library Book System
- [ ] Calculator with Result
- [ ] Transaction Type Parser (crypto)

### Milestone 4: Chapter 7 (Modules) - CURRENT
- [ ] Multi-Module Note-Taking CLI
- [ ] Calculator Plugin System
- [ ] 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)

### Milestone 6: Chapter 10 (Generics, Traits, Lifetimes)
- [ ] Generic Cache
- [ ] Comparable Trait
- [ ] Generic Transaction Validator (crypto)

## Post-Book Projects
### Simple Wallet Key Generator
- [ ] Generate keypair
- [ ] Save/load from file
- [ ] Sign messages

### RPC Client
- [ ] Query blockchain state
- [ ] Display balances
- [ ] Async HTTP, JSON parsing

## Reflections

### 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.

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*This file tracks overall learning journey and milestone completion*