Sha256: 37956eef70a89cc4e363074ecf730bda39239f013f6c7d4366fdc56ea323dc62
Contents?: true
Size: 831 Bytes
Versions: 396
Compression:
Stored size: 831 Bytes
Contents
Palindrome = Struct.new(:value, :factors)
class Palindromes
attr_reader :range
def initialize(options)
max = options.fetch(:max_factor)
min = options.fetch(:min_factor) { 1 }
@range = (min..max)
end
def generate
@palindromes = {}
range.each do |i|
range.each do |j|
product = i * j
if palindrome?(product)
palindrome = @palindromes[product] || Palindrome.new(product, [])
palindrome.factors << [i, j].sort
palindrome.factors.uniq!
@palindromes[product] = palindrome
end
end
end
end
def palindrome?(number)
number.to_s == number.to_s.reverse
end
def sort
@palindromes.sort_by do |key, _palindrome|
key
end
end
def largest
sort.last[1]
end
def smallest
sort.first[1]
end
end
Version data entries
396 entries across 396 versions & 1 rubygems