Step by Step solution about How to resolve the algorithm The Twelve Days of Christmas step by step in the Ruby programming language

The provided source code is a Ruby program that prints the lyrics of the Christmas carol "The Twelve Days of Christmas", with each line of the song being printed on a separate day.

Here's a detailed explanation of the code:

1. Initialization:
   • Two arrays are initialized:
     • gifts contains the lyrics of the song, with one line per element.
     • days contains the names of the days of Christmas.
2. Iteration:
   • The each_with_index method is used to iterate over the elements of the days array, with the current element being assigned to the variable day and the index to the variable i.
   • For each day, the following actions are performed:
     • The song line for the current day is printed: "On the #{day} day of Christmas"
     • The line "My true love gave to me:" is printed.
     • The elements of the gifts array from the beginning to the current index (i+1) are reversed and printed, representing the gifts received on that day.
     • An empty line is printed to separate the different days.
3. Output:
   • The program prints the lyrics of the song, one line for each day. For example, on the first day, the output would be:

     On the first day of Christmas
     My true love gave to me:
     A partridge in a pear tree
     
     

gifts = "A partridge in a pear tree
Two turtle doves and
Three french hens
Four calling birds
Five golden rings
Six geese a-laying
Seven swans a-swimming
Eight maids a-milking
Nine ladies dancing
Ten lords a-leaping
Eleven pipers piping
Twelve drummers drumming".split("\n")

days = %w(first second third fourth fifth sixth
seventh eighth ninth tenth eleventh twelfth)

days.each_with_index do |day, i| 
  puts "On the #{day} day of Christmas"
  puts "My true love gave to me:"
  puts gifts[0, i+1].reverse
  puts
end