menu_book Course Curriculum (Ruby) expand_more
Define_method
Learn define_method in Ruby through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.
define_method is an atomic Ruby topic inside Procs and Lambdas. The example uses the named construct directly so you can see its syntax, data flow, and observable behavior.
Read the code by locating the exact feature named define_method, then trace the value before and after that feature runs. This lesson is intentionally isolated from neighboring topics: changing identifiers alone would not reproduce the same behavior because the construct itself is different.
Topic-specific example
class Greeter
define_method(:hello){|name| "Hi #{name}"}
end
puts Greeter.new.hello("A")For define_method, test the boundary that makes the feature meaningful: invalid input, an empty value, a missing branch, lifecycle/cleanup, or a type/runtime constraint. Do not infer correctness only from the happy path.