This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.

Converting Between Degrees and Radians
CodeExpectedActual
class Numeric
  def degrees
    self * Math::PI / 180 
  end
end
90.degrees
 1.5707963267949 1.5707963267949 
Math::tan(45.degrees)
 1.0 1.0 
Math::cos(90.degrees)
 6.12303176911189e-17 6.12303176911189e-17 
Math::sin(90.degrees)
 1.0 1.0 
Math::sin(89.9.degrees)
 0.999998476913288 0.999998476913288 
Math::sin(45.degrees)
 0.707106781186547 0.707106781186547 
Math::cos(45.degrees)
 0.707106781186548 0.707106781186548 
require 'rubygems'
require 'units/base'
class Numeric
  remove_method(:degrees) # Remove the implementation given in the Solution
  add_unit_conversions(:angle => { :radians => 1, :degrees => Math::PI/180 })
  add_unit_aliases(:angle => { :degrees => [:degree], :radians => [:radian] })
end
90.degrees
 90.0 90.0 
90.degrees.unit
 :degrees :degrees 
90.degrees.to_radians
 1.5707963267949 1.5707963267949 
90.degrees.to_radians.unit
 :radians :radians 
1.degree.to_radians
 0.0174532925199433 0.0174532925199433 
1.radian.to_degrees
 57.2957795130823 57.2957795130823 
Math::sin(90.degrees)
 0.893996663600558 0.893996663600558 
Math::sin(90.degrees.to_radians)
 1.0 1.0 
class << Math
  alias old_sin sin
  def sin(x)
    old_sin(x.unit == :degrees ? x.to_radians : x)
  end
end
90.degrees
 90.0 90.0 
Math::sin(90.degrees)
 1.0 1.0 
Math::sin(Math::PI/2.radians)
 1.0 1.0 
Math::sin(Math::PI/2)
 1.0 1.0