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Mixin it up
- 2. Mixin It Up! NIKHIL SHAHI – 1801 BE
- 3. Modules? Do Tell… Used to hold a collection of methods and/ or constants Defined similar to a class
- 4. How Do We Access This Module? Need to ‘include’ the module in the class
- 5. Differences Between A Module And A Class Provides both state (instance variables) and behavior (instance methods) Can inherit features from a parent class Cannot directly inherit features from multiple parent classes (multiple inheritance) Only provides behavior (instance methods as well as class methods) Cannot inherit from a class Cannot make an instance of a module Class Module
- 6. A Class Can Inherit Methods From Multiple Modules
- 7. Mix It Up: Black Thursday Project has multiple classes with some repetitive methods Create a module that holds these repetitive methods ‘Include’ this module in the classes that have the repetitive code Eliminate around 24 methods across these classes Will need to add one or two methods per class to get this to work Code will look tighter and cleaner
Editor's Notes
- Modules are essentially used to hold a collection of methods Defined similar to a class Can define a module as shown We can now make that method available to the class as if it were defined in the class itself
- To access the methods of a module in a class, we need to ”include” the module in the class By including (or mixin’ in) our module ‘AwesomeName’, we have made the method ‘some_method, available to our class The method is available even though we don’t specifically see it listed anywhere in the class We could thus call ‘some-method’ as shown
- A module is similar to a class, but whereas a class provides both state and behavior, a module only provides behavior A module can’t inherit from a class and one can’t make an instance of a module On the flip side, a class can inherit features from a parent class but cannot inherit features from multiple parent classes Ruby modules pave the way to sidestep this drawback, by allowing a class to inherit functionality from multiple modules, by way of mixins
- Let’s say we have 3 different modules, each having a method If we now include these 3 modules in our ‘NotSoAwesome’ class, we can allow that class to inherit all the 3 methods (and the corresponding functionality) from these modules Modules are also great as they allow us to share common methods between multiple classes, by ‘mixin’ them into the classes We could thus give any number of classes, access to the methods in these modules Here class A and class B have access to all the 3 methods, across 3 modules
- I believe you all are going to be working on your final paired project which to me was super interesting. Is it Black Thursday? Perfect project to try using modules Essentially, you will have to work with multiple classes and some of them have repetitive methods If I remember correctly, there are 6 classes that have 4 methods each that are similar So create a module that holds this repetitive code and then call that module in those 6 classes By doing so, you will eliminate around 24 methods across your