Ruby example

class Thing
  attr_accessor :location

  def initialize(x,y)
    @location = Location.new(x,y)
  end
end

class Location
  attr_accessor :x, :y

  def initialize(x, y)
    @x = x
    @y = y
  end
end

rnd = Random.new
things = [*0..10].map { |x|
  Thing.new(rnd.rand(100), rnd.rand(100))
}

puts things.inspect

sorted_things = things.each.sort { |a, b| a.location.x <=> b.location.x }

puts sorted_things.inspect

Sample output:

[#<Thing:0x0055f89db51b48 @location=#<Location:0x0055f89db51b20 @x=94, @y=86>>, #<Thing:0x0055f89db51af8 @location=#<Location:0x0055f89db51a58 @x=77, @y=15>>, #<Thing:0x0055f89db51a30 @location=#<Location:0x0055f89db51a08 @x=3, @y=97>>, #<Thing:0x0055f89db519e0 @location=#<Location:0x0055f89db51990 @x=25, @y=5>>, #<Thing:0x0055f89db51968 @location=#<Location:0x0055f89db51940 @x=29, @y=85>>, #<Thing:0x0055f89db51918 @location=#<Location:0x0055f89db518f0 @x=60, @y=48>>, #<Thing:0x0055f89db51878 @location=#<Location:0x0055f89db51800 @x=42, @y=55>>, #<Thing:0x0055f89db517b0 @location=#<Location:0x0055f89db51710 @x=15, @y=61>>, #<Thing:0x0055f89db51698 @location=#<Location:0x0055f89db51670 @x=64, @y=46>>, #<Thing:0x0055f89db51580 @location=#<Location:0x0055f89db514b8 @x=11, @y=71>>, #<Thing:0x0055f89db51468 @location=#<Location:0x0055f89db513c8 @x=70, @y=76>>]
[#<Thing:0x0055f89db51a30 @location=#<Location:0x0055f89db51a08 @x=3, @y=97>>, #<Thing:0x0055f89db51580 @location=#<Location:0x0055f89db514b8 @x=11, @y=71>>, #<Thing:0x0055f89db517b0 @location=#<Location:0x0055f89db51710 @x=15, @y=61>>, #<Thing:0x0055f89db519e0 @location=#<Location:0x0055f89db51990 @x=25, @y=5>>, #<Thing:0x0055f89db51968 @location=#<Location:0x0055f89db51940 @x=29, @y=85>>, #<Thing:0x0055f89db51878 @location=#<Location:0x0055f89db51800 @x=42, @y=55>>, #<Thing:0x0055f89db51918 @location=#<Location:0x0055f89db518f0 @x=60, @y=48>>, #<Thing:0x0055f89db51698 @location=#<Location:0x0055f89db51670 @x=64, @y=46>>, #<Thing:0x0055f89db51468 @location=#<Location:0x0055f89db513c8 @x=70, @y=76>>, #<Thing:0x0055f89db51af8 @location=#<Location:0x0055f89db51a58 @x=77, @y=15>>, #<Thing:0x0055f89db51b48 @location=#<Location:0x0055f89db51b20 @x=94, @y=86>>]