originally published 10/16/2017 on the Hashrocket TIL blog

Ruby’s Binding class allows you to access classes, variables, and methods outside of your current scope.

class Foo
    def bar
        my_var = 20
        binding()
    end
end

Normally, if you made reference to my_var outside of that method, you’d get an error. Binding objects allow you to do this:

my_foo = Foo.new

foo_bar = my_foo.bar
puts foo_bar.eval('my_var')

# 20

Photo by Jonny Caspari on Unsplash