Ruby | Array repeated_permutation() function

Array#repeated_permutation() : repeated_permutation() is a Array class method which returns all repeated permutations of length n of the elements of the array, then return the array itself.

Syntax: Array.repeated_permutation()

Parameter: Array

Return: all repeated permutations of length n of the elements of the array, then return the array itself.

Example #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"

Output :

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 : 
    []

Example #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"

Output :

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]]