Follow an order-summary program from data to output, then test empty input, incorrect types and missing keys.

Campaign spreadsheets get messy very fast. One person tracks followers, another tracks video views, and somebody else has the monthly service charge tucked away in a column. All of it relates to the same campaign, although the figures need different…

Choose a practical Ruby project by its inputs, output and failure rules, from a cleanup script to a shared web application.

GitHub, Shopify and Airbnb turn up in almost every list of websites made with Ruby. Familiar names are useful, but they only answer part of the question. How many sites use Ruby, and what does it mean when a crawler…

A Rails feature rarely stops with the Ruby code. A booking form needs a usable layout, a controller needs tests, and a slow dashboard may need its database queries reviewed. AI tools can help with these jobs, though each calls…