请教把一个数组重新随机排序的最简单写法 - Project1

arr = ["元素1","元素2","元素3","元素4"] #目标数组，想把这个数组内的元素重新随机排序
 
arr_1 = [] #自己建立的辅助数组
 
for i in 0...arr.size
  arr_1[i] = arr.delete_at(rand(arr.length)) 
end  
 
arr=arr_1
 
p arr

arr = ["元素1","元素2","元素3","元素4"] #目标数组，想把这个数组内的元素重新随机排序


 


arr_1 = [] #自己建立的辅助数组


 


for i in 0...arr.size


  arr_1[i] = arr.delete_at(rand(arr.length)) 


end  


 


arr=arr_1


 


p arr

def shuffle!(arr)
for i in 0...arr.size
j = rand(arr.size - i) + i
arr[i],arr[j] = arr[j],arr[i]
end
end
arr1 = [1,2,3,4,5]
shuffle!(arr1)
puts arr1

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class Array
def shuffle!
for i in 0...self.size
j = rand(self.size - i) + i
self[i],self[j] = self[j],self[i]
end
end
end
arr1 = [1,2,3,4,5]
arr1.shuffle!
puts arr1

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#==============================================================================
# ■ Array
#------------------------------------------------------------------------------
# 数组的增强功能。
#==============================================================================
class Array
#--------------------------------------------------------------------------
# ● 洗牌
#--------------------------------------------------------------------------
def shuffle
self.clone.shuffle!
end
#--------------------------------------------------------------------------
# ● 破坏性洗牌
#--------------------------------------------------------------------------
def shuffle!
(size - 1).times do |i|
j = i + rand(size - i)
t = self[j]; self[j] = self[i]; self[i] = t
end
end
#--------------------------------------------------------------------------
# ● 取样
#--------------------------------------------------------------------------
def sample(num = 1)
return [] if num <= 0
return self[rand(size)] if num == 1
ary = clone
return ary if num >= size
num.times do |i|
j = i + rand(size - i)
t = ary[j]; ary[j] = ary[i]; ary[i] = t
end
ary[0...num]
end
end

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