Patrones de dise帽o en Node.js
Qu茅 es Node.js y c贸mo impulsa tu negocio
Patrones de dise帽o esenciales en Node.js
Patr贸n Singleton y Factory en JavaScript
Implementaci贸n pr谩ctica de Singleton y Factory en JavaScript
Implementaci贸n del patr贸n Observer con EventEmitter en Node.js
Implementaci贸n de Middlewares en Node.js sin Express
Decorators e inyecci贸n de dependencias en JavaScript
Flujo de Datos con Node.js
Aprende qu茅 son Buffer y Streams en Node.js
C贸mo utilizar streams y pipelines en Node.js
C贸mo funciona el Event Loop en Node.js
Qu茅 es Libuv y c贸mo maneja la asincron铆a en Node.js
Estrategias para ejecutar c贸digo as铆ncrono en Node.js
Debugging y Diagn贸stico en Node.js
C贸mo utilizar el Debugger en Node.js para solucionar problemas
Uso de Diagnostic Channels en Node.js para observabilidad y diagn贸stico
Instrumentaci贸n y m茅tricas clave en performance para aplicaciones Node.js
Control de errores globales y manejo de se帽ales en Node.js
Implementaci贸n Eficiente de Logs con Pino en Node.js
Performance en Node.js
An谩lisis del event loop en aplicaciones Node.js usando Nsolid
C贸mo 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 T茅cnicas de Caching
Creando CLIs con Node.js
C贸mo crear aplicaciones CLI con Node.js
C贸mo Crear un CLI con Minimist y Manejar Argumentos en Node.js
Creaci贸n de un CLI con Node.js y Google Generative AI
Creaci贸n de Chat con IA usando CLI en Node
C贸mo Crear e Instalar tu Propio CLI de Node con npm
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The Singleton pattern is one of the fundamental concepts in JavaScript that allows maintaining only one instance of an object during the entire execution of an application. Its use ensures that, no matter how many times we try to instantiate it, the same object is always returned, thus providing consistency in its use.
What is the Singleton pattern in JavaScript?
In essence, the Singleton pattern ensures that there is only one instance of an object. Every time you try to create a new one, you simply get the object already created. This principle simplifies the management of shared resources such as global settings or single handles.
How to implement it correctly?
The proper way to implement this pattern in JavaScript involves a check in the constructor:
class Singleton { constructor() { if (Singleton.instance) { return Singleton.instance; } this.name = ''; Singleton.instance = this; return Singleton.instance; } setName(name) { this.name = name; }const singleton1 = new Singleton();const singleton2 = new Singleton();console.log(singleton1 === singleton2); // trueIt is important to remember that this pattern presents the logical condition of checking if the instance already exists: if it exists, it is returned directly, if not, a new one is created.
What is the Factory pattern in JavaScript?
The Factory pattern facilitates the creation of multiple objects of the same type through a common method or function, allowing flexibility and simplicity in your code. It is widely used in modern libraries and tools.
How is the Factory pattern implemented?
The implementation involves creating a class responsible for instantiating new objects:
class Pet { constructor(name) { this.name = name; }}class PetFactory { createPet(name) { return new Pet(name); }const factory = new PetFactory();const pet1 = factory.createPet('Firulais');const pet2 = factory.createPet('Max');console.log(pet1 === pet2); // falseHere we see how Factory helps in the efficient creation of similar but distinct objects.
What is the difference between Singleton and Factory?
While Singleton maintains a single instance of the created object, Factory allows us to generate as many different instances of the same type as we need. They are complementary patterns used according to the situation and need of the design:
- Singleton ensures uniqueness in the object instance.
- Factory generates new instances according to specific requirements, maintaining flexibility and customization.
We invite you to leave your comments and questions about these patterns in JavaScript; your participation is valuable to continue delving into relevant topics for your professional development.
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