dynamic_local_variables

🔍 Dynamic Local Variables with Binding

Ruby's Binding object allows introspection and manipulation of local variables at runtime, which is invaluable for metaprogramming and live debugging. You can retrieve, set, and even define new local variables dynamically using local_variable_* methods and eval. This approach enables on‑the‑fly adjustments to scope without redefining methods.

def demo_binding
  x = 1
  b = binding

  # List existing locals
  p b.local_variables            # => [:x]

  # Define a new local variable `y`
  b.local_variable_set(:y, 2)
  p b.eval("x + y")            # => 3

  # Create and retrieve another
  b.eval("z = x * y")
  p b.local_variable_get(:z)     # => 2
end

demo_binding