Ruby教程之注释、变量声明以及数组操作

class Person  #类名

   @@year = 2013 # 类变量
 
   def initialize(name)  # 构造函数名
    @name = name  # 示例变量
   end

   def name  # 方法名
     @name
   end

   def name=(name)
     @name = name
   end
  
end

puts mystr

## 2、输出
puts "Output:\n"
print arr3,"\n"   # 输出：["1", "2", "3"]
puts arr3[0]      # 输出：1
print arr3.join(",")  # 输出：1,2,3

## 3、访问数组元素
puts "\nArray Element\n"
puts "\n", arr3[0]
puts "\n", arr3[-1]    #这个比较有意思，意思是最后一个的数据
puts "\n", arr3.first
puts "\n", arr3.last
puts "\n", arr3.max
puts "\n", arr3.min
puts "\n", arr3.length
puts "\n", arr3.size

## 4、数组操作
puts "\nArray method\n"
puts "\n", arr3[4] = '5'                    #此时arr3[3]默认尾nil
puts "\n", arr3.delete_at(3)                #删除指定下标的元素
puts "\n", arr3[2] = ["3a","3b","3c"]       #可以这样来做
puts "\n", arr3.delete(["3a","3b","3c"])    #可以删除上面添加的
puts "\n", arr3.push('6')                   #插入元素
puts "\n", arr3.insert(3,"b")               #在指定位置插入新元素
puts "\n", arr3<<"f"<<2                     #从左至右一次加入元素
puts "\n", arr3.pop                         #删除尾元素
puts "\n", arr3.shift                       #删除首元素
puts "\n", arr3.clear                       #清空数组

## 5、数组运算
puts "\nArray Operator\n"
aaa = [" aa ",4,5," bb "]
bbb = [4,1,3,2,5]
print aaa + bbb,"\n"        # 输出：[" aa ", 4, 5, " bb ", 4, 1, 3, 2, 5]
print aaa*2,"\n"     # 输出：[" aa ", 4, 5, " bb ", " aa ", 4, 5, " bb "]
print bbb - aaa,"\n"        # 输出：[1, 3, 2]
print aaa | bbb,"\n"        # 输出：[" aa ", 4, 5, " bb ", 1, 3, 2]
print aaa & bbb,"\n"        # 输出：[4, 5]
print bbb.sort,"\n"         # 输出：[1, 2, 3, 4, 5] 排序
print aaa.reverse,"\n"      # 输出：[" bb ", 5, 4, " aa "] 倒置
print bbb.sort.reverse,"\n" # 输出：[5, 4, 3, 2, 1] 降序