A Ruby method that evals a string of code and returns a hash of all locals defined inside

eval_bang.rb

# Eval a string of code, returning a hash of all local variables and their values.
#
# @param [String] code
# @param [Binding] binding
# @param [String] file (shows up in backtrace if an error occurs)
# @param [Integer] line (shows up in backtrace if an error occurs)
# @return [Hash] a map of :local_var => value_of_that_var
def eval!(__code__, binding = nil, file = __FILE__, line = (__LINE__ + 1))
  eval <<-SOURCE, binding, file, line
    #{__code__}
    local_variables.each_with_object({}) do |var, store|
      store[var] = eval("\#{var}")
    end
  SOURCE
end

if $0 == __FILE__
  locals = eval!("hello_world = 'Hi!'")
  locals[:hello_world] == "Hi!"
end