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A. Classes
Classes are BLUEPRINT (templates or recipes) on how to create objects. Like real world blueprints that are a set of instructions on how to build something (e.g., a house, a car). classes are blueprints on "how to" build objects. Note, they are not objects but instructions on how to build objects. When you create an object from a class, you can create an instance of that object from that class. Multiple objects (instances) can be created from the same class (blueprint).
B. Prototypes
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C. Objects
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Key points to remember about classes and objects:
- Classes names by best practice begin with a capital letter (e.g., Number)
- To create instance of an object you use the new key word constructor function (e.g., var myObject = new Object()). Instances of an object share COMMON properties (e.g., height, width). Yet at the same time, they have properties UNIQUE to themselves (e.g., color). Usually, instances of a class share common methods, however; custom methods can be defined for individual instances which is called polymorpism
- When thinking about what properties will be needed when creating an object, think of the things you would like to change (e.g., x/y, width/heigt, alpha) and then make them the
- Objects are SPECIFIC instances of a class. The process of creating an object from a class is called INSTANTIATION.