class Person
attr_reader :name, :age, :height
def initialize(name, age, height)
@name, @age, @height = name, age, height
end
def inspect
"#@name #@age #@height"
end
end
class Array
def sort_by(sym)
self.sort {|x,y| x.send(sym) <=> y.send(sym) }
end
end
people = []
people << Person.new("A", 5, 9)
people << Person.new("B", 2, 4)
people << Person.new("C", 6, 8)
people << Person.new("D", 3, 3)
p1 = people.sort_by(:name)
p2 = people.sort_by(:age)
p3 = people.sort_by(:height)
p p1
p p2
p p3