# File lib/more/facets/module/attr_validator.rb, line 8 def attr_validator(*symbols, &validator) made = [] symbols.each do |symbol| define_method "#{symbol}=" do |val| unless validator.call(val) raise ArgumentError, "Invalid value provided for #{symbol}" end instance_variable_set("@#{symbol}", val) end made << "#{symbol}=".to_sym end made end