Introduction to Bindings

The Pixaxe book defines Binding objects to: encapsulate the execution context at some particular place in the code and retain this context for future use. You can get a Binding for the current context by calling Kernel#binding. The Binding stores information about the variables, methods, and self and you can access them by passing the Binding to eval. class Product def set_title(title) @title = title end def get_binding binding end end p = Product.new p.set_title("nice and shiny") q = Product.new q.set_title("old and ugly") eval "@title", p.get_binding # => "nice and shiny" eval "@title", q.get_binding # => "old and ugly" You can see here that @title gets evaluated differently depending on the binding. The first eval returns "nice and shiny" because that is the value of @title for the first Product p. Blocks and Procs Blocks carry information about their Binding. a = "inside a" a_block ...