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An alternative to the builder pattern, e.g. for configuration APIs.

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class Capybara
class << self
attr_accessor :default_wait_time
 
def magic(a,&b)
puts "doing magic for #{a}"
yield
puts "mischief managed"
end
 
def configure &b
instance_exec &b
end
end
end
 
Capybara.configure do
@default_wait_time = 23
magic "foo" do
puts "abra cadabra!"
end
end
 
p Capybara.default_wait_time
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