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Entendiendo Promesas en JavaScript

This book is a translation into Spanish of Understanding JavaScript Promises which was originally written in English

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About

About

About the Book

Desde que las Promesas fueron añadidas a JavaScript en 2015, se han convertido en una parte integral del lenguaje. Un buen entendimiento de cómo las Promesas trabajan es más importante que nunca para convertirnos en desarrolladores competentes en JavaScript. Este libro fue escrito como introducción a las Promesas y sus peculiaridades en un formato fácil y directo de leer. Cada capítulo es acompañando con ejemplos prácticos y del día a día, usando las técnicas mencionadas; todos estos ejemplos están disponibles para descargar con la compra.

Qué vas a aprender:

  • Qué partes de las Promesas son síncronas y cuáles son asíncronas
  • Cómo efectivamente usar una cadena de Promesas para simplificar tu código
  • La mejor manera de atrapar errores en las Promesas
  • Cómo crear tus propias Promesas
  • Maneras de trabajar con múltiples Promesas como si fuesen una
  • Cómo las funciones asíncronas ("async") y la expresión "await" esconden las complejidades de las Promesas
  • Qué pasa con las Promesas rechazadas que no tienen funciones de manejo asociadas

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This book is a translation into Spanish of Understanding JavaScript Promises which was originally written in English

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Author

About the Authors

Nicholas C. Zakas

Nicholas C. Zakas is an independent software engineer, consultant, coach, and has authored over a dozen books. He created the ESLint open source project and has worked on everything from small websites to massive-scale web applications. He has worked at Box as a principal architect and Yahoo as a presentation architect. Nicholas is a strong advocate for development best practices including progressive enhancement, accessibility, performance, scalability, and maintainability.

Juan La Jara

Contents

Table of Contents

Introducción

  1. Acerca de este libro
  2. Compatibilidad con el navegador, Node.js y Deno
  3. Agradecimientos
  4. Acerca del autor
  5. Sobre el traductor
  6. Descargo de responsabilidad

1. Conceptos básicos de Promesas

  1. Ciclo de vida de las Promesas
  2. Creando nuevas Promesas (incompletas)
  3. Creando Promesas completadas
  4. Usando Promise.resolve()
  5. Usando Promise.reject()
  6. Resumen

2. Encadenando Promesas

  1. Atrapando errores
  2. Usando “finally()” en una cadena de Promesas
  3. Retornando valores en una cadena de Promesas
  4. Retornando Promesas en una cadena de Promesas
  5. Conclusión

3. Trabajando con múltiples Promesas

  1. El método Promise.all()
  2. El método Promise.allSettled()
  3. El método Promise.any()
  4. El método Promise.race()
  5. Resumiendo

4. Funciones “Async” y expresiones “Await”

  1. Definiendo funciones asíncronas
  2. Qué hace a una función asíncrona diferente
  3. Resumen

5. Seguimiento de rechazos sin funciones de manejo

  1. Detectando rechazos sin funciones de manejo
  2. Seguimiento de rechazos sin funciones de manejo en el navegador
  3. Seguimiento de rechazos sin funciones de manejo en Node.js
  4. Resumen

Ideas finales

  1. Descarga material extra
  2. Colabora con el autor
  3. Ayuda y soporte
  4. Sigue al autor

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