Our Daily Method #2: Numeric#in

Geplaatst door Michiel de Mare wo, 06 feb 2008 06:00:00 GMT

Most web-applications do not appear to have a lot to do with random numbers, online poker sites excepted (I hope), but they are surprisingly useful nevertheless. That’s why I’m introducing a new notation to express chance.

# this certainly works
redirect_to home_url if rand < 0.2222

# this is better
redirect_to home_url if rand(9) < 2

# but not as beautiful as this
redirect_to home_url if 2.in 9

# the code
class Numeric 
  def in(other)
    rand(other) < self

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