Anchor Deck

1. Problem Statement

As codebases develop, isolated examples no longer reveal how components behave when they interact. Learners may struggle to locate incorrect assumptions within functions that depend on shared data. Changes to one module can introduce unexpected behavior elsewhere in a program. Handling invalid inputs and unusual states also requires deliberate design decisions. Without a repeatable approach to testing and review, identifying the source of a problem becomes difficult.

2. Solution

Anchor Deck introduces systematic methods for examining program behavior and improving component organization. Lessons connect testing concepts with readable Rust examples and practical exercises. Learners explore validation rules, module interfaces, and techniques for separating calculations from input handling. Guided activities demonstrate how to examine errors, document expectations, and revise code while preserving intended behavior. A connected project offers opportunities to combine these methods in a structured workflow.

3. What's Inside

Module 1 — Design Before Implementation

Examine component responsibilities, input requirements, and output expectations. Use short planning exercises to describe how functions cooperate and where data validation belongs.

Module 2 — Tests as Written Expectations

Study unit tests, assertions, test cases, and boundary conditions. Practice comparing expected outcomes with actual behavior for arithmetic, text handling, and structured records.

Module 3 — Integration Across Modules

Explore how related components communicate through public interfaces. Follow examples that organize internal helpers, shared types, and interdependent operations without obscuring their responsibilities.

Module 4 — Invalid Data and Error Paths

Investigate input validation, recoverable errors, and distinct failure scenarios. Create structured responses for missing fields, inconsistent records, and operations that cannot continue.

Module 5 — Reviewing and Refining Code

Learn to identify duplicated logic, unclear naming, and tightly connected functions. Guided revisions demonstrate how to reorganize implementations while retaining observable behavior.

Module 6 — The Anchor Record Workshop

Create a compact record-processing project with separate parsing, validation, and reporting components. Complete targeted tests, inspect unexpected results, and document design choices through a concluding review.

4. Who Is This For?

Anchor Deck is intended for learners comfortable with Rust functions, structures, traits, modules, and error handling. It is suited to those who want additional practice evaluating interconnected components and making reasoned decisions about program structure.

5. What You'll Learn

• Define component responsibilities and input rules.

• Write focused unit tests and assertions.

• Identify boundary cases and invalid inputs.

• Organize modules around clear interfaces.

• Represent recoverable errors with structured types.

• Trace unexpected behavior across functions.

• Refine duplicated or tightly connected code.

• Document design decisions and review results.

6. Guarantee

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