Grade = Struct.new(:sym, :base)
GRADES = [
Grade.new(:S, 160),
Grade.new(:A, 120),
Grade.new(:B, 100)
].each_with_object({}){|g,h| h[g.sym] = g }.freeze
class Person
attr_reader :name, :grade
def initialize(name:, grade:)
@name, @grade = name, GRADES[grade]
end
end
class Review
class Excellent < Review
def call(base) base + 50 end
end
class Standard < Review
def call(base) base end
end
class Poor < Review
def call(base) base * 0.8 end
end
def self.of(sym)
@_types ||= {
excellent: Excellent.new,
standard: Standard.new,
poor: Poor.new
}
@_types[sym]
end
def call(base); end
end
class Bonus
attr_reader :person, :review
def initialize(person, review:)
@person, @review = person, Review.of(review)
end
# Ϙʔφε: άϨʔυ͝ͱͷϕʔεֹۚΛධՁʹΑͬͯ૿ݮֹͤͨۚ͞
def call
@person.grade.base.then {|b| @review.call(b)}
end
end
QFSTPOͷάϨʔυ͝ͱͷج४ֹۚΛɺ
ϨϏϡʔ݁Ռʹͯ͠ɺϘʔφεΛࢉग़͠
͍ͯΔ UFMM
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