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Rust

My plan for learning Rust in March 2026 I aim to spend about 4 hours per week on this.

Weekly learning

Week 1 - Ownership & Moves ✅

Implement a CLI tool:

  • Reads file
  • Counts word frequency
  • Outputs sorted results

Constraints:

  • No cloning unless necessary
  • Explain every move

Questions:

  • When does a move occur?
  • Why does String move but i32 copy?

Week 2 - Borrowing & References

Refactor week 1 tool to:

  • Avoid unnecessary moves.
  • Use references.
  • Implement functions that borrow instead of take ownership.
  • Intentionally create borrow checker errors, then fix them.

Document:

  • Why the error occurs.
  • What rule is being enforced.

Week 3 - Lifetimes

Create:

  • A small struct holding references.
  • Functions returning borrowed data.
  • Add explicit lifetime annotations.

Explain:

  • What lifetime annotations actually mean.
  • Why Rust can't infer some cases.

Week 4 - Into to Concurrency

Implement:

  • Multi-threaded word counter using Arc + Mutex

Questions:

  • Why is shared mutable state dangerous?
  • What problem does Mutex solve?
  • What is a data race formally?

Project

Concurrent Word Frequency CLI

Features:

  • Multi-threaded processing of large file
  • Safe shared state
  • No unsafe
  • Error handling

Deliverable

README explaining ownership, borrowing, lifetimes, and thread safety in my implementation

Checkpoint

  • Explain why borrow checker errors happen
  • Explain difference between move, borrow, and clone
  • Explain how Arc<Mutex<T>> ensures safety