Example snippets for #ish blog post

example_use_of_ish.rb

assert_equal record.created_at, Time.now.ish
assert_equal bullet.velocity, 5.25.ish

numeric_ish.rb

class Numeric
  def ish(acceptable_delta=0.001)
    ApproximateValue.new self, acceptable_delta
  end
end
class ApproximateValue
  def initialize(me, acceptable_delta)
    @me = me
    @acceptable_delta = acceptable_delta
  end

  def ==(other)
    (other - @me).abs < @acceptable_delta
  end

  def to_s
    "within #{@acceptable_delta} of #{@me}"
  end
end

space_ship_test_1.rb

@game_clock.tick
@space_ship.attrs.should == { x: 120, y: 0, rotation: 0 }

space_ship_test_2.rb

@space_ship.attrs.should == { x: 120.ish, y: 0.ish, rotation: 0.ish }

time_ish.rb

class Time
  def ish
    ApproxTime.new(self)
  end
end
class ApproxTime
  def initialize(t); @time = t; end
  def ==(o)
    return false if @time.nil? or o.nil?
    (@time - o).abs < 5
  end
end

You have def ish(acceptable_delta=0.001) twice in numeric_ish.rb, otherwise an awesome idea.

I have started using this now. @dcrosby42 what do you think about putting this in a gem?

gem 'equal-ish'

Easier to share across applications.