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Решение на Втора задача от Снежана Спасова

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Резултати

  • 6 точки от тестове
  • 0 бонус точки
  • 6 точки общо
  • 11 успешни тест(а)
  • 0 неуспешни тест(а)

Код

class Song
attr_accessor :name, :artist, :album
def initialize(text)
lines = text.split(/\r?\n/)
@name = lines[0]
@artist = lines[1]
@album = lines[2]
end
end
class Criteria
def call(song)
@criteria.call song
end
def initialize(criteria)
@criteria = criteria
end
def self.name(name)
Criteria.new lambda { |song| name == song.name }
end
def self.artist(artist)
Criteria.new lambda { |song| artist == song.artist }
end
def self.album(album)
Criteria.new lambda { |song| album == song.album }
end
def |(other)
Criteria.new lambda { |song| self.call(song) or other.call(song) }
end
def &(other)
Criteria.new lambda { |song| self.call(song) and other.call(song) }
end
def !
Criteria.new lambda{ |song| !self.call(song) }
end
end
class Collection
include Enumerable
def initialize(songs)
@songs = songs
end
def each
@songs.each { |song| yield song }
end
def self.parse(text)
songs = []
text.to_s.split("\n\n").each { |song| songs << Song.new( song ) }
self.new songs
end
def names
@songs.map { |song| song.name }.uniq
end
def artists
@songs.map { |song| song.artist }.uniq
end
def albums
@songs.map { |song| song.album }.uniq
end
def filter(criteria)
filtered_songs = @songs.select { |song| criteria.call song }
Collection.new(filtered_songs)
end
def adjoin(other)
Collection.new(@songs | other.to_a)
end
end

Лог от изпълнението

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Finished in 0.01028 seconds
11 examples, 0 failures

История (1 версия и 0 коментара)

Снежана обнови решението на 31.10.2012 14:03 (преди около 12 години)

+class Song
+ attr_accessor :name, :artist, :album
+
+ def initialize(text)
+ lines = text.split(/\r?\n/)
+ @name = lines[0]
+ @artist = lines[1]
+ @album = lines[2]
+ end
+end
+
+class Criteria
+ def call(song)
+ @criteria.call song
+ end
+
+ def initialize(criteria)
+ @criteria = criteria
+ end
+
+ def self.name(name)
+ Criteria.new lambda { |song| name == song.name }
+ end
+
+ def self.artist(artist)
+ Criteria.new lambda { |song| artist == song.artist }
+ end
+
+ def self.album(album)
+ Criteria.new lambda { |song| album == song.album }
+ end
+
+ def |(other)
+ Criteria.new lambda { |song| self.call(song) or other.call(song) }
+ end
+
+ def &(other)
+ Criteria.new lambda { |song| self.call(song) and other.call(song) }
+ end
+
+ def !
+ Criteria.new lambda{ |song| !self.call(song) }
+ end
+end
+
+class Collection
+ include Enumerable
+
+ def initialize(songs)
+ @songs = songs
+ end
+
+ def each
+ @songs.each { |song| yield song }
+ end
+
+ def self.parse(text)
+ songs = []
+ text.to_s.split("\n\n").each { |song| songs << Song.new( song ) }
+ self.new songs
+ end
+
+ def names
+ @songs.map { |song| song.name }.uniq
+ end
+
+ def artists
+ @songs.map { |song| song.artist }.uniq
+ end
+
+ def albums
+ @songs.map { |song| song.album }.uniq
+ end
+
+ def filter(criteria)
+ filtered_songs = @songs.select { |song| criteria.call song }
+ Collection.new(filtered_songs)
+ end
+
+ def adjoin(other)
+ Collection.new(@songs | other.to_a)
+ end
+end