Ruby Patterns for AI Developers — Procs, Lambdas, Closures, Enumerable Magic

By now you can read basic Ruby and understand classes. Good. But to read real Ruby comfortably, you also need the patterns Ruby developers lean on all the time. This means understanding a few core ideas: procs lambdas closures Enumerable These are not academic features. They show up everywhere in Ruby, Rails, and AI-adjacent code that transforms data, filters records, builds pipelines, and wraps behavior. Let’s make them practical. A proc is a chunk of callable behavior A proc lets you store behavior in a variable and call it later. upcase_text = Proc.new { |text| text.upcase } puts upcase_text.call("ruby for ai") Output: RUBY FOR AI That may look small, but it matters. You can pass behavior around just like data. For example, maybe you want a reusable text post-processor: clean_output = Proc.new do |text| text.strip.gsub(/\s+/, " ") end raw = " hello from model " puts clean_output.call(raw) Output: hello from model Lambdas are stricter procs Ruby has both Proc and lambda. They are sim