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Ruby Programming
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Other Forms of Assignment

In common with many other languages, Ruby has a syntactic shortcut: a=a+2 may be written as a+=2.

The second form is converted internally to the first. This means that operators that you have defined as methods in your own classes work as you'd expect.

class Bowdlerize
  def initialize(aString)
    @value = aString.gsub(/[aeiou]/, '*')
  end
  def +(other)
    Bowdlerize.new(self.to_s + other.to_s)
  end
  def to_s
    @value
  end
end
a = Bowdlerize.new("damn ") d*mn
a += "shame" d*mn sh*m*

Ruby Programming
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