Redefine existing methods while calling their previous version by another name.
Similar to Rails's alias_method_chain, but without all the boilerplate.
require 'around'
Array.def_around(:map, :eval_str) do |eval_s = nil, &block|
!eval_s ^ !block or raise ArgumentError, "Must provide either eval_s or block."
block ||= lambda { |_| eval(eval_s, binding) }
map_without_eval_str &block
end
puts [1, 2, 3].map("_ * 2").join(", ") # => 2, 4, 6
def_aroundclass_def_aroundsingleton_class_def_around
around_disable_featureclass_around_disable_featuresingleton_class_around_disable_feature
© 2009 Caio Chassot. Released under the WTFPL.