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S kills : changing property values

How geeks see the (object oriented) world. S kills : changing property values C oncepts : object, class, property (attribute), value, data type. This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Where does this topic fit?. Internet concepts

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S kills : changing property values

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  1. How geeks see the (object oriented) world Skills: changing property values Concepts: object, class, property (attribute), value, data type This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

  2. Where does this topic fit? • Internet concepts • Applications • Technology • Implications • Internet skills • Application development • Content creation • User skills

  3. To a geek, the world is made up of objects that have properties and those properties have values. That is kind of abstract – how about an example?

  4. Regular person: That is a pretty girl! • Geek: That is an instance of the class person. • The value of its height property is 64 inches. • The value of its weight property is 130 pounds. • The value of its age property is 25. • The value of its hair-color property is black. Let’s try a second example …

  5. Regular person: Cool old car! • Geek: That is an instance of the class car. • The value of its body-color property is ___. • The value of its wheel-color property is ___. • The value of its number-of-wheels property is ___. • The value of its number-of-doors property is ___. • The value of its manufacturer property is ___. • The value of its model property is ___. • The value of its year-manufactured property is ___. • The value of its horsepower property is ___.

  6. Instances of the class person What are some of the properties of persons? What values can they take on?

  7. These objects might be on a computer screen What class of object are these?

  8. Instances of the class line What are some of the properties of a line?

  9. Different values of the color property of a line

  10. Location of a line on the screen Y x

  11. Data type validity My computer cost 500 dollars. My computer cost purple dollars. (fail) I am six feet tall. I am purple feet tall. (fail) Payday is Friday. Payday is 500. (fail) My phone number is 310-123-4567. My phone number is 310-four567. (fail)

  12. Right click to see properties and their values The Alto at Xerox PARC, 1973

  13. Set property values with a dialog box

  14. Summary

  15. Self-study questions What are five properties of instances of the class dog? For each of the properties you listed, state a possible value. What are five properties of instances of the class house? For each of the properties you listed, state a possible value. Find three examples of objects with properties in Microsoft PowerPoint We saw that right clicking on an object often brings up a property dialog box. What class of object is the following dialog box for?

  16. Resources Objects in the JavaScript programming language: http://www.w3schools.com/js/js_obj_intro.asp

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