Ruby Blocks as Dynamic CallbacksCallbacks are a great technique for achieving simplicity and flexibility. Simply put, a callback is a block of code passed as an argument to a method. In Ruby, code blocks are everywhere and Ruby makes it trivial to pass a block of code to methods. For example: def foo(bar, &block) callback = block callback.call(bar) end foo(5) {|x| x * x} # => 25 But what do we do when a method needs two blocks o
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