Ruby的变量有以下几种: 一般小写字母、底线开头:变量,变量 (Variable)。 $开头:全域变量,全局变量 (Global variable)。 @开头:实体变量,实例变量 (Instance variable)。 @@开头:类别变量,类变量 (Class variable)。 大写字母开头:常数 (Constant)。 已经定义的类可以在运行时修改 Ruby是动态语言,你可以在程序中...
Ruby调用一个方法时,如果不带参数,则方法后的括号可以省略。e.g. my_method()也可写成my_method 以$开头的变量名是全局变量,以@开头的变量名是类的成员变量(instance variable),以@@开头的变量名是类的静态成员变量(class variable) 可以先阅读tut_hello_cube的代码和注释。这是一个Hello World级别的插件,执行...
是其他语言中的“属性”。当“经典”变量位于其方法/块的作用域时，实例变量则是对象的特定instance的...
Hamster- Efficient, immutable, and thread-safe collection classes for Ruby. - Memoize any instance/class/module method, including support for frozen objects - rigorously tested and benchmarked on all Rubies - fast performance of memoized reads. Fat Free CRM- An open source Ruby on Rails based ...
class instance variable 下面是用class variable的具体例子如下: classP@@v=1defself.v@@venddefclass_v@@vendendP.v#=> 1P.new.class_v#=> 1 下面是用class instance variable的具体例子如下: classP2@v=1defself.v@venddefclass_vself.class.vendendP2.v#=> 1P2.new.class_v#=> 1 ...
2 @ instance variable @id = [] Instance variables have the nil value until they are initialized. 3 @@ class variable @@name = [] Class variable must be initialized. 4 $ global variable $version = "0.8.9" Global variables have the nil value until they are initialized. 5 [A-Z] const...
To define a class or module, use the functions below:VALUE rb_define_class(const char *name, VALUE super) VALUE rb_define_module(const char *name)These functions return the newly created class or module. You may want to save this reference into a variable to use later....
问Ruby: initialize() vs class body？EN类主体中的代码只执行一次-当ruby加载文件时。每次创建类的新...
* * Returns the value of the given class variable (or throws a * <code>Name</code> exception The <code>@@</code> part of * variablename shouldbe included for regular class variables * String arguments are converted to * * class Fred * @@foo = 99 * end ...
class A BAR = 1 def foo(&b); instance_eval(&b) end end a = A.new a.foo { BAR } # => 1 vs. 1.8: class A BAR = 1 def foo(&b); instance_eval(&b) end end a = A.new a.foo { BAR } # => # ~> -:7: uninitialized constant BAR (NameError) ...