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pattern_matching_case_in.md

🎯 Advanced Pattern Matching with in​

Ruby 2.7+ supports structural pattern matching via case … in, allowing concise deconstruction of nested data. You can capture values, use the pin operator (^) to match existing variables, and leverage => to bind the entire matched object.

case { status: :ok, data: { id: 42, name: "Alice" } }
in { status: :ok, data: { id:, name: } }
  puts "ID=#{id}, Name=#{name}"
in { status: :error, error: } => err_obj
  puts "Error: #{err_obj[:error]}"
end