Section 5: Data Persistence, Serialization & Resilience

📄 Section Lessons

• Lesson 1: 5.1 File Persistence: Reading, Writing & Streaming I/O

  Volatile system memory vanishes once a program terminates. Learn how production software manages persistent disk I/O: safe atomic writes, block-scoped file descriptors, and memory-efficient streaming for large datasets.

  Start Lesson
• Lesson 2: 5.2 Structured Data: JSON Serialization & CSV Pipelines

  Real-world applications rarely store plain unstructured text. Learn how to serialize complex Ruby data structures into JSON for web APIs and parse tabular CSV datasets with headers and streaming row processing.

  Start Lesson
• Lesson 3: 5.3 Error Resilience: Defensive Programming with Exceptions

  Production software operates in an imperfect world of network drops, missing files, and invalid user payloads. Master Ruby's exception hierarchy, write defensive rescue clauses, and design domain-specific custom exception classes.

  Start Lesson