Ruby 数组 repeated_permutation()函数

Array#repeated_permutation() : repeated_permutation() 是Array类的一个方法，用于返回数组中所有长度为n的元素的重复排列，然后返回数组本身。

语法。Array.repeated_permutation()

参数。数组

返回：所有长度为n的数组元素的重复排列，然后返回数组本身。

例子 #1 :

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

输出:

repeated_permutation() method form : 
    [[18, 18], [18, 22], [18, 33], [18, nil], [18, 5], [18, 6], [22, 18], [22, 22], [22, 33], [22, nil], [22, 5], [22, 6], [33, 18], [33, 22], [33, 33], [33, nil], [33, 5], [33, 6], [nil, 18], [nil, 22], [nil, 33], [nil, nil], [nil, 5], [nil, 6], [5, 18], [5, 22], [5, 33], [5, nil], [5, 5], [5, 6], [6, 18], [6, 22], [6, 33], [6, nil], [6, 5], [6, 6]]

repeated_permutation() method form : 
    [[1], [4], [1], [1], [88], [9]]

repeated_permutation() method form : 
    []

例子 #2 :

# Ruby code for repeated_permutation() method
   
# declaring array
a = ["abc", "nil", "dog"]
   
# declaring array
c = [nil]
   
# declaring array
b = ["cow", nil, "dog"]
   
# repeated_permutation method example
puts "repeated_permutation() method form : 
    #{a.repeated_permutation(2).to_a}\n\n"
   
puts "repeated_permutation() method form : 
    #{b.repeated_permutation(1).to_a}\n\n"
   
puts "repeated_permutation() method form : 
    #{c.repeated_permutation(4).to_a}\n\n"

输出:

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

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

repeated_permutation() method form : 
    [[nil, nil, nil, nil]]