词汇：class
n. 班级；阶级；种类
相关场景
- Leshan Giant Buddha was ratified as a China Key Cultural Relic Unit under protection by the State Council in 1982, and it was listed as the World Cultural Heritages by UNESCO in 1996. The Leshan Giant Buddha Scenic Area has been listed as China's 5A Class Scenic Area, and one of the "Best Forty" tourist places of China.
乐山大佛于1982年被国务院批准为中国重点文物保护单位，1996年被联合国教科文组织列为世界文化遗产。乐山大佛景区已被列为中国5A级风景名胜区，也是中国“四十佳”旅游胜地之一。>> 18. Leshan Giant Buddha- 31. eval; instance_eval定义的是单例方法；:
- def glass_case_of_emotion x="I'm in a " + __method__.to_s.tr('_',' ') binding; binding 可以获得当前的临时域并把这个临时域封装到Binding对象中作为返回结果。这个指定的上下文是eval方法的第二个参数； eval("x", glass_case_of_emotion); class_eval很像是重新打开类，实际上是被定义在Module里面，only被模块和类使用。= moudle_eval; instance_eval访问实例变量；class_eval定义实例方法。 class Widget attr_accessor(:name, :quantity) def initialize(&block) instance_eval(&block) if block end ;;; w= Widget.new do |widget| widget.name= "Elbow Grease" ; @quantity = 0; end ; instance_exec, class_exec, moudle_exec; only accept 代码块， no string； object.instance_eval("@#{name} = DEFAULT")
module Reset def self.reset_var (object, name) object.instance_exec("@#{name}.to_sym") do |var| const = self.class.const_get(:DEFAULT); instance_variable_set(var, const) end ...>> Effective Ruby- 28. 模块和类的钩子方法:
- Ruby的hook在类和模块的级别实现元编程。在类和模块中定义方法-单例方法。混合引入模块时，ruby都会调用钩子方法included or extended；这个钩子可以看作是一个，通知通知当前模块即将要被扩展到另一个类中。代理的方法只是重定向了。interited; method_added method_removed method_undefined 实例方法；singleton_method_added singleton_method_remove singleton_mothod_undefined 可以被用于模块方法或类方法。这些方法只接受一个symbol ,方法名； Triggers singleton_method_removed(:hello) class << self; remove_mothod(hello);end>> Effective Ruby
- 22. raise:
- raise("coffee machine low on water") => raise(RuntimeError, "coffee machine low on water")
异常的处理是基于类型的。Exception or StandardError ; class CoffeeTooWeakError < StandardError; end
raise(CoffeeTooWeakError, "coffee to water ratio too low")
super("invalid temperature: #@temperature") raise(TemperatureError.new(180))>> Effective Ruby- 21.对集合和核心类优先使用委托而非继承:
- is a，还是 has a， 委托就是有一个。。。require('forwardable'); class RaisingHash extend(Forwardable) include(Enumerable) def_delegators(@hash, :[], :[]=, :delete, :each, :keys, :values, :length, :empty?, :has_keys) end Forwardable模块让使用委托的过程变得容易。 del_delegator(@hash, :delete, :erase!)>> Effective Ruby
- 15.优先使用实例变量:
- @@开头的变量是类变量，bind在类上。； 单例模式；private_class_method(:new, :dup, :clone) def self.instance @@single ||= new; 其实类方法是一个假象，类方法实际上是一个类的对象的实例方法。Singleton模块作为Ruby标准库的一部分；require('singleton'); class Configuration include(Singleton) end;>> Effective Ruby
- 1.false:
- 0 is true; true.class > TrueClass; false.class > FalseClass; 只有 false 和 nil 为false；如果你要区分false和nil，可以使用nil? 或 == 操作符，并将false作为左操作对象，以防止 == 这个方法被覆盖。>> Effective Ruby
- Now , Rails has a bunch of different ways you can do the CSS, there's also a path where you can use Tailwind. Lots of people like that for good reason, and there are a bunch of different options, all the major CSS frameworks are available, but by default, we ship with a no build, as I said, intention and simple CSS just make things look prettier without having to adorn anything with classes, or what have you.>> Rails 8.0.1 You are in good company
- If the student isn't motivated, if self-esteem is low, if anxiety is high , if the student is on the defensive, if the student thinks the language class is a place where his weaknesses will be revealed. he may understand the input, but it won't penetrate. It won't reach those parts of the brain that do language acquisition. A block keeps it out. We call this block the affective filter.>> comprehensible input - One way only one way to acquire a language
- On the other hand, we were in a German class and we could hang together for a couple of weeks. say an hour a day of German, and I could keep the input light and lively. as in the second example.you'd start to acquire German.It would come on its own. And eventually you'd start to talk, your speaking ability would emerge gradually.>> comprehensible input - One way only one way to acquire a language
- Teaching a class is part and parcel of my job as a teacher.
作为一名教师，教书是我工作的重要组成部分。>> 84-On Strike- Class of Sixty-five is having this event in six months.>> Good Will Hunting (1997)Movie Script
- SKYLAR:
- Well, I'm gonna experiment on you for my anatomy class, then go.>> Good Will Hunting (1997)Movie Script
- The class starts to pack up and file out. Lambeau approaches Sean who steps down from the lectern.>> Good Will Hunting (1997)Movie Script
- SEAN:
- (to class) Well, it seems we're in the presence of greatness. Professor Gerald Lambeau is a Field's Medal winner.
（对全班同学）好吧，看来我们面对的是伟大。杰拉尔德·兰博教授是菲尔德奖章获得者。>> Good Will Hunting (1997)Movie Script- Sean Maguire lectures to the class in a resigned tone. Tired of teaching, tired of life, he finds himself resigned to the tedium of teaching core classes to an indifferent student body.>> Good Will Hunting (1997)Movie Script
- INT. BUNKER HILL CAMPUS -- DAY This is SEAN MAGUIRE'S "Dying and Bereavement" class.>> Good Will Hunting (1997)Movie Script
- CLARK:
- Elementary? Oh, I don't doubt that it was. I remember the class, it was just between recess and lunch.>> Good Will Hunting (1997)Movie Script
- CHUCKIE:
- To tell you the truth, I wasn't there much. The class was rather elementary.>> Good Will Hunting (1997)Movie Script
- CLARK:
- Oh, I'm sure you covered it in your history class.>> Good Will Hunting (1997)Movie Script
- CHUCKIE:
- Hey, come on pal we're in classes all day. That's one thing about Harvard never seizes to amaze me, everybody's talkin' about school all the time.>> Good Will Hunting (1997)Movie Script
- CLARK:
- What class did you say that was?>> Good Will Hunting (1997)Movie Script
- SKYLAR:
- What class?>> Good Will Hunting (1997)Movie Script
- CHUCKIE:
- Yeah, cause I think I had a class with you.>> Good Will Hunting (1997)Movie Script
- LAMBEAU:
- Well, I'm sorry to disappoint my spectators, but it appears there will be no unmasking here today. I'm going to have to ask those of you not enrolled in the class to make your escape now or, for the next three hours be subjected to the mundities of eigenvectors.>> Good Will Hunting (1997)Movie Script