Complete Ruby Programmer - Master Ruby

Use code commenting in Ruby to document code and guide future readers, noting that comments do not run and can temporarily disable lines to test outputs.

Explore interactive ruby (irb) by launching irb, running quick expressions like puts and 2+2, and seeing immediate outputs, with tips on when to use files instead.

Discover how ruby strings work and how to interpolate ruby code inside a string to insert variables like a and b, enabling templating and dynamic output with puts.

Explore string manipulation in Ruby by reversing strings, using non-mutating and mutating methods, and understanding how index positions and bang methods change the original data.

Explore branching logic with else if in Ruby, moving beyond a simple if to handle multiple conditions from command-line input, including a catch-all fallback.

Learn how to find text inside strings using include, compare with equals, and apply conditionals like if, else, and case to user input such as days.

Learn how to iterate over ranges in Ruby using inclusive and exclusive syntax, reverse ranges, and the times method to process numbers without creating arrays.

explore enumerators in ruby, including how each with index yields item and position, calling without a block, and converting indices to strings to run array methods.

Open a file in Ruby, assign the file object to f, and print it with puts; explore existing versus non-existent files and future read, write, and close operations.

Learn how to write to a new file and append to it in Ruby, creating Bar.txt, demonstrating append mode versus overwrite, and verifying the file contents.

Learn how to guard file reads in Ruby by checking if a file exists before opening, then read and print its contents using conditionals and user input.

Explore binary trees as ordered data structures with a root node and left and right branches, enabling fast searches and scalable O(log n) performance in Ruby.

Explore domain modeling by translating real-world concepts into domain models and model classes, using a health insurance plan to illustrate interactions among payer, provider, and patients. Engage with domain driven design and the domain layer to build software that accurately represents complex business rules and relationships.

Save a person record to one per-employee file by opening the file in write mode and writing the first and last name, using a unique id in the filename.

Preview a solution to automate car shopping by extracting data from a car listings site and saving relevant results to a JSON file.

In Ruby, extract data from a car listings object by iterating with each through eight cars, using CSX to select make and year, retrieve text, and assemble a new collection.

Install and use Adam beautify to format JSON for clearer viewing; compare non beautified vs beautified output, run it to cast values to correct types, and save changes.

Explore how ruby gems work, from browsing ruby gems dot org and gem specs to versioning, licenses, dependencies, and the role of lib files in a gem’s structure.

Extract emails from server logs in Ruby by parsing a user agent string, applying regular expressions and match data captures, and assembling a user data structure with browser and email.

This lecture demonstrates building a flexible data pipeline for access logs by decoupling file discovery from processing, using pattern matching to load each file and output formatted results.