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@vgarro vgarro/excercise.rb
Created May 25, 2018

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# https://dev.to/r0f1/write-a-simple-but-impactful-script-7ba
# Write a script that produces all possible 4-digit numbers (0000...9999),
# then put them into a random order and
# save the output into a text file
class ExcerciseOrquestrator
attr_reader :output_file_name
def initialize(output_file_name)
@output_file_name = output_file_name
end
def process(digits)
output = NumberGenerator.new(digits).process
write_to_file(output)
end
private
def write_to_file(output)
open_file do |file|
output.each do |row|
file.write("#{row}\n")
end
end
end
def open_file
File.open(output_file_name, 'w') do |file|
yield(file)
end
end
end
class NumberGenerator
attr_reader :digits
def initialize(digits)
@digits = digits
end
def max_number
(10 ** digits) -1
end
def first_number
0
end
def process
arr = do_generate
(arr || []).shuffle
end
private
def do_generate
(first_number..max_number).each_with_object([]) do |digit, acc|
acc << digit.to_s.rjust(digits, '0')
end
end
end
ExcerciseOrquestrator.new('randon_numbers').process(4)
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