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Design Patterns
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Otemuyiwa Prosper
August 13, 2017
Programming
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Design Patterns
Otemuyiwa Prosper
August 13, 2017
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Transcript
Design Patterns Ruby Conf. Nigeria
❖ Software Developer ❖ Consultant at Auth0 ❖ Open Sourcerer
❖ Self-Acclaimed Developer Evangelist ❖ Community Builder ❖ Jollof Rice Ambassador ❖ Google Developer Expert ❖ Homeless Man
@unicodeveloper - GitHub - Twitter
...When no design pattern is involved.
None
...After you involve design patterns.
None
..A few things to note, thou developer
1. Design patterns are not a silver bullet to all
your problems.
2. Design patterns was made for man, not man for
design patterns.
3. They can prove to be a savior, or else
they can make you & your code a mess.
Design Patterns Grouped 1 2 ❖ Behavioral ❖ Creational ❖
Structural
Behavioral Design Patterns 1 3 ❖ Mediator ❖ Observer ❖
Strategy ❖ Visitor ❖ Iterator ❖ Command
Creational Design Patterns 1 4 ❖ Builder ❖ Prototype ❖
Singleton ❖ Factory ❖ Abstract Factory
Structural Design Patterns 1 5 ❖ Facade ❖ Composite ❖
Decorator ❖ Flyweight ❖ Adapter ❖ Bridge
..Know JavaScript? I’ll use it as an example to explain
the common design patterns that you should know & take advantage of in your codebase.
Singleton Pattern
Goals 1. Ensure that only one instance of a class
is created. 2. Provide a global point of access to the object.
Singleton 1 9
Singleton 2 0 What makes the Singleton is the global
access to the instance.
Prototype Pattern
Goals 1. Specify the kind of objects to create using
prototypical instance. 2. Create new objects by copying this prototype
Prototype 2 3
Prototype 2 4
Command Pattern
Goals 1. Encapsulate the request in an object 2. Allow
the parameterization of clients with different requests.
Command 2 7
Command 2 8 What if the core API of carManager
changed? What happens?
Facade Pattern
Goals 1. Outward appearance to the world which hides a
different reality. 2. Simpler public interface to avoid calling many internal methods to get some behavior working. 3. Ability to directly interact with subsystems in a way that can be less prone to accessing it directly.
Facade 3 1
Facade 3 2 JQuery’s document.ready() function is being powered by
bindReady()
Factory Pattern
Goals 1. Creates objects without exposing the instantiation logic to
the client. 2. Refer to newly created object through a common interface.
Factory 3 5
Factory 3 6
The Mixin Pattern
Goals 1. Allow objects to borrow functionality with a minimal
amount of complexity.
Mixin 3 9
Mixin 4 0
Decorator Pattern
Goals 1. Similar to Mixins. Aim to promote code reuse
2. Offer ability to add behaviour to existing classes in a system dynamically.
Decorator 4 3 Simple Use case
Decorator 4 4
Decorator 4 5 Decorating objects with multiple decorators
Module Pattern
Goals 1. Emulate the concept of classes. 2. Shield particular
parts from global scope and make everything simple.
Module 4 8
Module 4 9
Observer Pattern
Goals 1. Define a one to many dependency between objects
so that when one object changes state, all its dependents are notified and updated automatically.
Observer 5 2
Observer 5 3
Observer 5 4
Observer 5 5
Observer 5 6
Observer 5 7
Learning Resource http://www.oodesign.com/observer-pattern.html https://addyosmani.com/resources/essentialjsdes ignpatterns/book/
Thank You!