Patrones de diseño en Node.js
Qué es Node.js y cómo impulsa tu negocio
Patrones de diseño esenciales en Node.js
Patrón Singleton y Factory en JavaScript
Implementación práctica de Singleton y Factory en JavaScript
Implementación del patrón Observer con EventEmitter en Node.js
Implementación de Middlewares en Node.js sin Express
Decorators e inyección de dependencias en JavaScript
Flujo de Datos con Node.js
Aprende qué son Buffer y Streams en Node.js
Cómo utilizar streams y pipelines en Node.js
Cómo funciona el Event Loop en Node.js
Qué es Libuv y cómo maneja la asincronía en Node.js
Estrategias para ejecutar código asíncrono en Node.js
Debugging y Diagnóstico en Node.js
Cómo utilizar el Debugger en Node.js para solucionar problemas
Uso de Diagnostic Channels en Node.js para observabilidad y diagnóstico
Instrumentación y métricas clave en performance para aplicaciones Node.js
Control de errores globales y manejo de señales en Node.js
Implementación Eficiente de Logs con Pino en Node.js
Performance en Node.js
Análisis del event loop en aplicaciones Node.js usando Nsolid
Cómo Diagnosticar y Solucionar Memory Leaks en Aplicaciones Node.js
Optimizar rendimiento en Node.js con Worker Threads y Child Processes
Optimiza y Escala Aplicaciones Node.js con Técnicas de Caching
Creando CLIs con Node.js
Cómo crear aplicaciones CLI con Node.js
Cómo Crear un CLI con Minimist y Manejar Argumentos en Node.js
Creación de un CLI con Node.js y Google Generative AI
Creación de Chat con IA usando CLI en Node
Cómo Crear e Instalar tu Propio CLI de Node con npm
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Combining design patterns such as Singleton and Factory allows solving everyday situations in software development, ensuring efficiency and clarity in the creation and handling of objects. In this practical example, you will learn how to integrate these two patterns in JavaScript, creating a useful system to handle logs in different contexts such as console and file.
What is a Singleton and how to implement it in JavaScript?
The Singleton pattern ensures that a class has a single instance throughout the application, facilitating control over specific resources, such as logs or database connections.
To create a Singleton in JavaScript:
- Define a class, in this case
Logger, with a static method that checks if an instance already exists, and if not, creates it. - Create an array within the class to store single logs.
- It implements specific methods, such as
logto add messages with a timestamp andgetLogsthat returns the complete array of logs.
How does the Factory pattern work in combination with the Singleton?
The Factory pattern gives you the facility to create objects of different types according to your specific implementation needs. When you combine Factory with Singleton:
- You create a log factory file
(loggerFactory.js) that instantiates different logger (such as Console or File). - In each specific class, such as
ConsoleLogger, you encapsulate the Singleton instance of Logger to ensure efficient resource sharing. - You use the Factory via a static
CreateLoggermethod to easily generate instances adapted to the required type (console or file).
How to carry out this practical implementation?
The clear and simple procedure to implement this effective combination in JavaScript is:
- Create the file structure, with logger.js as Singleton and loggerFactory.js as Factory pattern.
- Clearly define each class involved as
ConsoleLoggerandFileLogger, each with individual tailored logic. - Use an
index.jsfile to import, instantiate and concretely use these objects. - Troubleshoot possible implementation errors, such as correctly defining the necessary instances when importing objects from modules.
This practical exercise also presents you with an interesting challenge to deepen your learning. Try to complete the implementation so that the FileLogger actually stores the messages in a real file and share your achievements in the comments.
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