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Assorted code writen during a Ruby lecture
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class Song | |
attr_reader :name, :artist, :genre, :subgenre, :tags | |
def initialize(name, artist, genre, subgenre, tags) | |
@name = name | |
@artist = artist | |
@genre = genre | |
@subgenre = subgenre | |
@tags = tags | |
end | |
end | |
class Collection | |
def initialize(songs) | |
@songs = songs | |
end | |
def first | |
@songs.first | |
end | |
def self.parse(input) | |
songs = input.lines.map do |line| | |
name, artist, genre_and_subgenre, tags_as_string = line.split('.').map(&:strip) | |
genre, subgenre = genre_and_subgenre.split(',').map(&:strip) | |
tags = if tags_as_string.nil? | |
[] | |
else | |
tags_as_string.split(',').map(&:strip) | |
end | |
Song.new name, artist, genre, subgenre, tags | |
end | |
new songs | |
end | |
end |
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require 'minitest/unit' | |
require './collection' | |
INPUT = <<END | |
My Favourite Things. John Coltrane. Jazz, Bebop. popular, cover | |
Greensleves. John Coltrane. Jazz, Bebop. popular, cover | |
Alabama. John Coltrane. Jazz, Avantgarde. melancholic | |
Acknowledgement. John Coltrane. Jazz, Avantgarde | |
Afro Blue. John Coltrane. Jazz. melancholic | |
'Round Midnight. John Coltrane. Jazz | |
My Funny Valentine. Miles Davis. Jazz. popular | |
Tutu. Miles Davis. Jazz, Fusion. weird, cool | |
Miles Runs the Voodoo Down. Miles Davis. Jazz, Fusion. weird | |
Boplicity. Miles Davis. Jazz, Bebop | |
Autumn Leaves. Bill Evans. Jazz. popular | |
Waltz for Debbie. Bill Evans. Jazz | |
'Round Midnight. Thelonious Monk. Jazz, Bebop | |
Ruby, My Dear. Thelonious Monk. Jazz. saxophone | |
Fur Elise. Beethoven. Classical. popular | |
Moonlight Sonata. Beethoven. Classical. popular | |
Pathetique. Beethoven. Classical | |
Toccata e Fuga. Bach. Classical, Baroque. popular | |
Goldberg Variations. Bach. Classical, Baroque | |
Eine Kleine Nachtmusik. Mozart. Classical. popular, violin | |
END | |
class CollectionTest < MiniTest::Unit::TestCase | |
# My Favourite Things. John Coltrane. Jazz, Bebop. popular, cover | |
def test_parsing_a_collection_file | |
collection = Collection.parse(INPUT) | |
song = collection.first | |
assert_equal 'My Favourite Things', song.name | |
assert_equal 'John Coltrane', song.artist | |
assert_equal 'Jazz', song.genre | |
assert_equal 'Bebop', song.subgenre | |
assert_equal %w[popular cover], song.tags | |
end | |
def test_tags_is_an_empty_array_if_not_specified | |
input = 'Acknowledgement. John Coltrane. Jazz, Avantgarde' | |
collection = Collection.parse(input) | |
song = collection.first | |
assert_equal song.tags, [] | |
end | |
end |
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require './tests' | |
class Rat | |
attr_reader :num, :den | |
def initialize(num, den) | |
gcd = num.gcd den | |
@num = num / gcd | |
@den = den / gcd | |
end | |
def ==(other) | |
num == other.num and den == other.den | |
end | |
def +(other) | |
Rat.new num * other.den + other.num * den, den * other.den | |
end | |
def -(other) | |
self + -other | |
end | |
def -@ | |
Rat.new(-num, den) | |
end | |
end | |
ok Rat.new(1, 2).num == 1 | |
ok Rat.new(1, 2).den == 2 | |
ok Rat.new(1, 2) == Rat.new(1, 2) | |
ok Rat.new(3, 2) != Rat.new(1, 2) | |
ok Rat.new(1, 3) != Rat.new(1, 2) | |
ok Rat.new(1, 2) == Rat.new(2, 4) | |
ok Rat.new(15, 20) == Rat.new(9, 12) | |
ok Rat.new(1, 2) + Rat.new(3, 4) == Rat.new(5, 4) | |
ok Rat.new(1, 2) + Rat.new(1, 2) == Rat.new(1, 1) | |
ok Rat.new(3, 4) - Rat.new(1, 2) == Rat.new(1, 4) | |
ok(-Rat.new(3, 4) == Rat.new(-3, 4)) |
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