Ruby/Language Basics/Variable scope
Материал из Wiki.crossplatform.ru
(Различия между версиями)
Версия 17:10, 26 мая 2010
Содержание |
have two local variables with the same name but in different scopes
def basic_method x = 50 puts x end x = 10 basic_method puts x
items declared in those methods are restricted to those methods.
text = "No worries." def greeting() text = "No problems." puts text end greeting puts text
Local Variables versus Methods
# If a local variable exists with the same name as a method, # the local variable will be referenced # unless you put parentheses behind the method or use self.methodName. def colors(arg1="blue", arg2="red") "#{arg1}, #{arg2}" end colors = 6 print colors # The above outputs 6.
Reference an undefined variable in a method
def basic_method puts x end x = 10 basic_method
using only local variables
def returnFoo bar = "Ramone, bring me my cup." return bar end puts returnFoo # But this code is not allowed: def returnFoo bar = "Ramone, bring me my cup." return bar end puts bar