A Final Word

In this column we introduced a new feature of Internet Explorer 5.0: Dynamic Properties. We explained and emphasized the benefits of dynamic properties, and taught you how to use them. You can set an expression, remove an expression, and also get an expression. We clarified the two opposite schools of thought, lazy evaluation and forced recomputation. We showed you how to use the recalc() method. We demonstrated all these new features with a solar system example that includes the Sun, the Earth, and the Moon. The positions of the planets are set at the beginning by setting proper dependencies.

In this column you learned:

• What are the benefits of Dynamic Properties
• How to set a dynamic property
• How to get a dynamic property
• How to remove a dynamic property
• How to force a recalculation
• How to program the Solar System, Part I
• How to program the Solar System, Part II

We also provided you with the listings of the Solar System as well as its zipped format.