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Strategies & Market Trends : Free Float Trading/ Portfolio Development/ Index Stategies
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From: dvdw©4/3/2008 10:07:20 AM
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Bids this low are being rejected. how come? real people having their say? what say you, Adam Smith?

[edit] Action at a distance across objects
Proper object oriented programming involves design principles that avoid action at a distance. The Law of Demeter states that an object should only interact with other objects near itself. Should action in a distant part of the system be required then it should be implemented by propagating a message. Proper design severely limits occurrences of action at a distance, contributing to maintainable programs. Pressure to create an object orgy results from poor interface design, perhaps taking the form of a God object, not implementing true objects, or failing to heed the Law of Demeter.

One of the advantages of functional programming is that action at a distance is de-emphasised, sometimes to the point of being impossible to express at all in the source language.

Being aware of the danger of allowing action at a distance into a design, and being able to recognize the presence of action at a distance, is useful in developing programs that are correct, reliable and maintainable. Given that the majority of the expense of a program may be in the maintenance phase, and that action at a distance makes maintenance difficult, expensive and error prone, it is worth effort during design to avoid.

[edit] See also
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