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Implementing Set Functionality (equality) in Ruby Classes
require 'set'
# Here's our simple point class that contains two integers, x and y
class Point
attr_accessor :x, :y
def initialize(x,y)
@x, @y = x, y
def eql?(other)
other.is_a?(Point) &&
[x,y] == [other.x, other.y]
def hash
p1 =,1)
p2 =,1)
p3 =,1)
puts p1 == p2 # false
puts p1.eql?(p2) # true
points = [p1, p2, p3]
points.each {|e|
p e.hash # 13, 13, 9
# NOTE: your memory locations will vary
puts # #<Set: {#<Point:0x103573880 @x=1, @y=1>, #<Point:0x1035735b0 @x=0, @y=1>}>
puts points.uniq.inspect # [#<Point:0x103573880 @x=1, @y=1>, #<Point:0x1035735b0 @x=0, @y=1>]
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