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person.rb
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person.rb
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class Person
@@array = Array.new
def self.all
@@array
end
# rather than manually managing an array, we could instead use Objectspace
# however, this confuses things a bit in testing
# def self.all
# ObjectSpace.each_object(self).entries
# end
# this is (or should be) used only for testing
def self.clear_array
@@array = Array.new
end
# takes as input a regexp and a string containing one entry per line
# I was originially going to create a subclass for each parsing option
# but this ended up being cleaner, really
def self.initialize_multiple(regexp, list)
list.each_line do |line|
results = line.chomp.match(regexp)
self.new results
end
end
# just for kicks, and to be real meta, let's abstract these to work for any field
# I'm not using it, I just thought it would be cool to throw in
def self.all_by_attribute(attr)
self.all.sort { |a,b| a.send(attr) <=> b.send(attr) }
end
# output 1 - appears to be by gender (female/male) then by last name
# unclear how identical last names should be ordered
def self.all_by_gender_and_last_name
# sorting by gender really doesn't insure that the last name ordering is maintained
# so instead we're just grabbing groups from a last name sorted list
results = self.all_by_last_name
results.select { |p| p.gender == "Female" } + results.select { |p| p.gender == "Male" }
end
# output 2 - appears to be by birthdate
# unclear how identical birthdates should be ordered
def self.all_by_date_of_birth
self.all.sort { |a,b| a.date_of_birth <=> b.date_of_birth }
# alternate: self.all_by_attribute(:date_of_birth)
end
# output 3 - appears to be by last name, reversed
# unclear how identical last names should be ordered
# I'm actually doing it forward and expecting it to be reversed by the caller
def self.all_by_last_name
self.all.sort { |a,b| a.last.downcase <=> b.last.downcase }
end
attr_accessor :first, :last, :gender, :favorite_color, :day, :month, :year, :date_of_birth
def initialize(attrs = {})
@first = attrs[:first]
@last = attrs[:last]
@gender = attrs[:gender]
# Normalize gender value to match desired output format
if @gender.upcase == "M"
@gender = "Male"
elsif @gender.upcase == "F"
@gender = "Female"
end
@favorite_color = attrs[:favorite_color]
@year = attrs[:year]
@month = attrs[:month]
@day = attrs[:day]
# we compute date of birth object to use in comparisons
# but keep the input elements because it's less of a pain to format the outpus
@date_of_birth = Date.new(@year.to_i, @month.to_i, @day.to_i)
@@array << self
end
def to_s
"#{@last} #{@first} #{@gender} #{@month}/#{@day}/#{@year} #{@favorite_color}"
end
end