需要加盐吗？

def m(a,b=2,*c,d) puts "a = #{a} ,b = #{b} ,c = #{c} ,d = #{d} "endm(1,3)# a = 1 ,b = 2 ,c = [] ,d = 3m(1,3,5)# a = 1 ,b = 3 ,c = [] ,d = 5m(1,3,5,7)# a = 1 ,b = 3 ,c = [5] ,d = 7m(1,3,5,7,9)# a = 1 ,

# code创建一个`win.rb` 文件：```PS C:\Users\Administrator\RubyCode> ls-a--- 2016/6/3 16:52 142 win.rb```使用`prepend M`语句 ， `module win` ：```module M def hello puts "Module win!" endend

public_method_defined?在A类中定义了一个hello方法，使用public_method_defined?就可以判断是不是存在 ：PS C:\Users\Administrator\Rubycode> irb --simple-prompt>> class A>> def hello>> puts "hello hi">> end>> end>> A.pub

:: namespace在module里面放了一个class，要实例化这个class，需要用M::C.new , module M 起到了namespace的作用，从视觉上大大加强代码的可读性：PS C:\Users\Administrator> irb --simple-prompt>> module M>> class C>> end>> end=> nil>> t = M::C.

>> if puts "Hello world">> puts "You can't see this">> endHello world=> nil

obj = Object.newdef obj.hello "hello world"enddef obj.year "2016/05/23"endputs "obj's id is #{obj.object_id}"puts "Information : "request = gets.chompif obj.respond_to?(request)

# self ！- **test_self.rb** ```puts "Top Level"puts "self is #{self}" # self is mainclass C puts "Class definition block : " puts "self is #{self}" #self is C # class method def self.x puts "Cl

code# file : nest2.rbclass A x = 'A' module M x = 'M' class B x = 'B' def show_x x = 'X' puts x end

PS C:\Users\Administrator> irb --simple-prompt>> class Time>> def hour_minute_seconds>> time = $hour + ":">> time << "#{$minute} : " if $minute>> time << "#{$second}">> end>> end=> :hour_minute_

class C def hello(a, recurse = false) print "Now , self is : " p self print "self object id is : " p self.object_id print "And here's a : " puts a print "a has object id : " p a.object_id p

：：String# File : ex.rbclass V class String attr_reader :picth def initialize(picth) @picth = picth + " From My String" puts @picth end end d

@@class_variablesTestCase想象这样一个场景，一次小班授课，参加的学生有A B C 三人 ，这时候老师开始提问了，我们使用类Student 记录 ： 到场的学生名单；每人答题次数；老师总的提问次数CodeClass Student 类@@names存着学生名单的数组 ； @@answers存着每个学生答题次数的哈希表 ；@@total_answers存着老师总

yieldyield关键字可以实现从方法method到块block的往返.exampleoutputPS E:\ruby> ruby test_yield.rb1.method2.block3.back to the methodsource codedef test puts "1.method" yield puts "3.back to the meth

reference 《The Well-Grounded Rubyist, Second Edition》 (https://www.manning.com/books/the-well-grounded-rubyist-second-edition)あついおっ～～～～～　 ∧ ∧　γ⌒ヽ 　(* 'ω')i ミ(二i　( ∪ ∪ ヽ、,_||　と＿)＿) 　r-!!

# code in file `abc.rb````class SuperABC def initialize @a = 1 @b = 2 @c = 3 endendclass ABC < SuperABC def initialize super # keyword @a = 0 end def a puts @a end def b puts @b

在Windows上安装ruby-doc ri 工具安装步骤Ruby的命令行文档工具ri ，一般安装步骤[1]1.在终端运行 gem install rdoc-data 安装2.然后需要生成 ri 数据,在终端运行 rdoc-data –install gem rdoc –all –overwrite gem rdoc --all --ri --no-rdoc可能会遭

PS C:\Users\Administrator\RubyCode> rake admin:clean_tmpDelete ./tmp/新建文本文档 - 副本 (2).txt? yDelete ./tmp/新建文本文档 - 副本 (3).txt? yDelete ./tmp/新建文本文档 - 副本 (4).txt? yDelete ./tmp/新建文本文档 - 副本 (5).txt? yDelete ./

.replace()打开irb ：PS C:\Users\Administrator> irb --simple-prompt创建字符串变量str ，值为“hello”，赋值给变量abc，本质是使abc指向同一个字符串对象，所以均输出为同一个“hello” ：>> str = "Hello"=> "Hello">> abc = str=> "Hello"对str 变量使用.replac

Ruby local_variable 可用命名格式a_anamefirst_namehello48user_ID_Ruby如何区分local_variable /keyword/ method call Identifier difference keyword 诸如def 、if之类keyword，Ruby内置一张关键词的表，可以直接判断出来 local_varia

class Sugar def price=(amount) @price = amount end def price @price endend

PS C:\Users\Administrator\RubyCode> irb --simple-prompt>> 100.is_a?(Numeric)=> true

class Test attr_reader :name, :sex attr_writer :age attr_accessor :weight def initialize(name, sex, weight) @name = name @sex = sex @weight = weight endend

Ruby安装下载https://www.ruby-lang.org/en/downloads/测试是否安装成功Windows >> PowerShell >>> ruby -vruby 2.3.0p0 (2015-12-25 revision 53290) [x64-mingw32]Ruby资源Learn Ruby the Hard Way, 3rd Edition. (Zed.Shaw)英文原

irb –simple-promptPS C:\Users\Administrator> irbirb(main):001:0> exit()PS C:\Users\Administrator> irb --simple-prompt>> exit()PS C:\Users\Administrator>irb –simple-prompt 模式更“清爽”puts print p创建两个变量x

ruby -cw xx.rbruby检查代码语法　ruby 后面加个 -cwPS C:\Users\Administrator\RubyCode> more ex11.rb# missing "puts "Hello ,worldPS C:\Users\Administrator\RubyCode> ruby -cw ex11.rbex11.rb:2: unterminated strin

Run新建了一个文件temp.dat 存了一个数据，整数 100PS C:\Users\Administrator\RubyCode> more temp.dat100PS C:\Users\Administrator\RubyCode> ruby c2fin2out.rbReading Celsius temperature value from data file...The Celsius

- 打开`irb` ，定义一个`Super`类 ```PS C:\Users\Administrator> irb --simple-prompt>> class Super>> def say_hello>> "hello">> end>> end=> :say_hello>> class My < Super>> end```

irb --simple-prompt -rrbconfig

# load "loadee.rb"# require "./loadee.rb"# require "./loadee"require_relative "loadee"

使用`ruby -e "..."`可以在命令行直接运行脚本```PS C:\Users\Administrator\RubyCode> ruby -e "print 'Enter a name: '; print gets.reverse"Enter a name: TommoTPS```

setset是Ruby的标准库的类；打开irb使用，需要先写语句 require 'set';codeirb$ irb --simple-prompt>> require 'set'=> true创建两个集合 ()里面放一个数组即可>> first = Set.new(["A","B","C","D"])=> #<Set: {"A", "B", "C", "D"}>>> sec