🤓 Simplify Complexity with the Facade Design Pattern in TypeScript
#ts #patterns
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#ts #patterns
Life is full of complexities. Even when we go about our everyday routines, we often interact with systems that are intricate behind the scenes but seem simple on the surface. Imagine driving a car. We don’t need to understand the nuances of its internal combustion engine or the intricacies of its transmission system. We just turn the key, press the gas pedal, and off we go!
The same principle applies in the realm of software development, where we often encounter systems with daunting complexity. That’s where the Facade Design Pattern comes in handy. It provides a simplified, easy-to-use interface over a more complex underlying system, just like the controls in our car!
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📄 Angular’s GoF patterns. Factory Method.
#angular #patterns
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#angular #patterns
Advantages:
— Flexibility and expandability: Allows for easy introduction of new types of products without changing existing code.
— Reducing dependencies: The Factory Method reduces the direct dependency between classes that create and use objects, making code modification and testing simpler.
— Ease of maintenance and updates: Code using the pattern is easier to maintain and update, as adding a new type of product often doesn’t require changes to the existing code that uses the factory.
Disadvantages:
— Complex architecture: Using Factory Method can complicate application architecture, especially when used unnecessarily or in simple scenarios.
— Code bloat: Creating many factory methods and classes can overload the code, making it hard to understand, particularly for new developers.
— Performance issues: In some cases, particularly with incorrect implementation, Factory Method can affect application performance due to additional method calls and object creations.
— Debugging difficulty: Following this pattern can make debugging harder since the actual object creation is hidden within the factory method, complicating error tracking.
— Need for careful planning: Effective use of Factory Method requires detailed planning and understanding of when and what objects should be created. Planning errors can lead to incorrect or excessive implementation.
— Limited flexibility in some scenarios: While Factory Method provides flexibility in object creation, it can be limited in scenarios requiring very dynamic or conditional object creation.
— Not suitable for simple applications: For small or simple applications with a relatively static structure, using Factory Method might be unnecessary and complicate the project.
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📄 1/8 JS Reactive Patterns: PubSub or Publish-Subscribe
#js #patterns #pubsub
#js #patterns #pubsub
PubSub is one of the most commonly used and fundamental reactivity patterns. The Publisher is responsible for notifying Subscribers about the updates and the Subscriber receives those updates and can react in response.
One popular example of its usage is Redux. This popular state management library is based on this pattern (or more specifically, the Flux architecture). Things work pretty simple in the context of Redux:
— Publisher: The store acts as the publisher. When an action is dispatched, the store notifies all the subscribed components about the state change.
— Subscriber: UI Components in the application are the subscribers. They subscribe to the Redux store and receive updates whenever the state changes.
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📄 2/8 JS Reactive Patterns: Custom Event Targets
#js #patterns #customEvent
#js #patterns #customEvent
If you prefer not to dispatch events globally on the window object, you can create your own event target.
By extending the native EventTarget class, you can dispatch events to a new instance of it. This ensures that your events are triggered only on the new class itself, avoiding global propagation. Moreover, you have the flexibility to attach handlers directly to this specific instance.
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📄 3/8 JS Reactive Patterns: Observer
#js #patterns #observer
#js #patterns #observer
The Observer pattern is really similar to PubSub. You subscribe to the Subject and then it notifies its subscribers (Observers) about changes, allowing them to react accordingly. This pattern plays a significant role in building decoupled and flexible architecture.
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📄 5/8 JS Reactive Patterns: Individual Object Properties and Reactivity
#js #patterns #defineProperty
#js #patterns #defineProperty
If you don’t need to track all the fields in the objects, you can choose the specific one using Object.defineProperty or group of them with Object.defineProperties.
📄 6/8 JS Reactive Patterns: Reactive HTML Attributes With MutationObserver
#js #patterns #MutationObserver
#js #patterns #MutationObserver
One way to achieve reactivity in the DOM is by using MutationObserver. Its API allows us to observe changes in attributes and also in the text content of the target element and its children.
📄 7/8 JS Reactive Patterns: Custom Events as a Browser Version Of PubSub
#js #patterns #CustomEvent
#js #patterns #CustomEvent
The browser offers an API for triggering and subscribing to custom events through the CustomEvent class and the dispatchEvent method. The latter provides us with the ability not only to trigger an event but also to attach any desired data to it.
📄 8/8 JS Reactive Patterns: Reactive Scrolling With IntersectionObserver
#js #patterns #IntersectionObserver
#js #patterns #IntersectionObserver
The IntersectionObserver API enables reacting to the intersection of a target element with another element or the viewport area.
📄 Angular Design Patterns: Factory Pattern
#angular #patterns #guide
⚠️ The example is for presentation purposes only and can be refactored.
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#angular #patterns #guide
⚠️ The example is for presentation purposes only and can be refactored.
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