红宝石 |数组旋转（）函数

Array#rotate() : rotate()是一个 Array 类方法，它通过旋转 self 返回一个新数组，以便 count 处的元素是新数组的第一个元素。

Syntax: Array.rotate()

Parameter: Array

Return: a new array by rotating self so that the element at count is the first element of the new array.

示例 #1：

# Ruby code for rotate() method
  
# declaring array
a = [18, 22, 33, nil, 5, 6]
  
# declaring array
b = [1, 4, 1, 1, 88, 9]
  
# declaring array
c = [18, 22, 50, 6]
  
# rotate method example
puts "rotate() method form : #{a.rotate(2)}\n\n"
  
puts "rotate() method form : #{b.rotate(1)}\n\n"
  
puts "rotate() method form : #{c.rotate(-1)}\n\n"

输出 ：
rotate() 方法形式：[33, nil, 5, 6, 18, 22]

rotate() 方法形式：[4, 1, 1, 88, 9, 1]

rotate() 方法形式：[6, 18, 22, 50]

示例 #2：

# Ruby code for rotate() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
c = ["cat", nil]
  
# declaring array
b = ["cow", nil, "dog"]
  
  
# rotate method example
puts "rotate() method form : #{a.rotate(2)}\n\n"
  
puts "rotate() method form : #{b.rotate(1)}\n\n"
  
puts "rotate() method form : #{c.rotate(-1)}\n\n"

输出 ：

rotate() method form : ["dog", "abc", "nil"]

rotate() method form : [nil, "dog", "cow"]

rotate() method form : [nil, "cat"]