3) JS Prototypes Flashcards
Explain the prototype concept as it relates to JS objects.
Every object has a prototype property, initially however js object prototypes are empty. In order to give an object a prototype property you simply use the protoypal pattern. The important thing to know is that the prototypal property is used most often for its inheritance functionality.
Prototype is not countable or it is enumerable, so it is not accessible in a for/in loop.
So how would you use the prototypal property? Whenever you make copies of a function, you can easily add properties to all the copies at once by adding prototypal properties to the original object.
Speaking of working with prototypes, you know that prototypes are used mainly for their inheritance potentiality. Give an example of how you would use inheritance.
Explanation:
(a) You’d first create an object funciton.
(b) Then you’d give that object a prototype property, maybe a property function that prints out something.
(c) You’d then create a new object that inherits all the properties of the first object.
(d) Note that when you call the print function on the new object the new object will respond!
How would you go about finding out the parent of a certain protoype and why is that important to know how to do?
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