Pakiderm
Allows you to memoize simple methods and works only on ruby 2.0.
Usage
class Counter
extend Pakiderm
def increment
@sum = 1 + @sum.to_i
end
memoize :increment
end
Your method will only be called the first time, the result will be stored and returned on subsequent invocations.
counter = Counter.new
=> Counter
counter.increment
=> 1
counter.increment
=> 1
counter.increment = 5
=> 5
counter.increment
=> 5
As you can see, it also provides an assignment operator, so you can override the memoized value :smiley:.
Background
Pakiderm uses Module#prepend to add the memoized method before yours in the method lookup path of your class. Your method is called by using 'super', because the class is an ancestor to the prepended module.
Corolary
If you override a memoized method in a derived class, you alter the method chain, so the derived method won't be memoized unless you invoke memoize in the derived class as well.