/usr/bin/ruby -w#定义类classBox#构造器方法definitialize(w,h)@width,@height=w,hend#实例方法默认是 public 的defgetAreagetWidth()*getHeightend#定义 private 的访问器方法defgetWidth@widthenddefgetHeight@heightend#make them privateprivate:getWidth, :getHeight#用于输出面积的实例方法defprintArea@area=...
You may get different resolution result after this change. Please report such cases to RubyGems/Bundler issues RubyGems still uses Molinillo resolver in Ruby 3.2. We plan to replace it with PubGrub in the future. Other notable changes since 3.1 Data New core class to represent simple immutable...
1 # 基本形式 2 irb(main):029:0> dict = {'cat'=>'cat1', 'dog'=>'dog1'} 3 => {"cat"=>"cat1", "dog"=>"dog1"} 4 # key必须为字符串或者标志 5 irb(main):030:0> dict2 = {cat=>cat1} 6 NameError: undefined local variable or method `cat' for main:Object 7 Did you...
class_eval do define_method "#{attribute}=" do |value| instance_variable_set("@#{attribute}", value) end define_method attribute do instance_variable_get "@#{attribute}" end end end add_checked_attribute(Person, :age) add_checked_attribute(Person, :sex) me = Person.new me.age = 18...
puts "当前计数: #{Counter.get_count}" # 输出: 当前计数: 1 4. 全局变量初始化 全局变量在整个程序中可见,可以在任何地方初始化。 示例 ruby $global_variable = "我是全局变量" puts $global_variable # 输出: 我是全局变量 5. 默认值 局部变量在使用前必须初始化,否则会抛出 NameError。
6 有两个方法可以操作实例变量:Object#instance_variable_get()方法和Object#instance_variable_set()方法. 7 钩子方法 1classString2defself.inherited(subclass)3puts"#{self} was inherited by #{subclass}"4end5end6classMyString < String ;end#=> String was inherited by MyString ...
instance_variable_get(var) ruby 1.8 特性 取得并返回对象的实例变量的值. 可以使用字符串或者Symbol来向var指定实例变量名. 若实例变量尚未定义,则返回nil. 1 2 3 4 5 6 7 8 9 10 classFoo definitialize @foo=1 end end obj = Foo.new
local,global, instance and class. In addition, Ruby has one constant type. Each variable type is...
ConditionVariable#wait Queue#pop, SizedQueue#push Thread#join Kernel#sleep Process.wait IO#wait, IO#read, IO#write and related methods (e.g. #wait_readable, #gets, #puts and so on). IO#select is not supported. This example program will perform several HTTP requests concurrently: ...
class.c common.mk compar.c compile.c complex.c configure.ac constant.h cont.c darray.h debug.c debug_counter.c debug_counter.h dir.c dir.rb dln.c dln.h dln_find.c dmydln.c dmyenc.c dmyext.c encindex.h encoding.c enum.c ...