September 2024
Intermediate to advanced
706 pages
22h 41m
Spanish
Content preview from JavaScript: La Guía Definitiva, 7ª Edición
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Capítulo 6. Objetos
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Objetos son el tipo de datos más fundamental de JavaScript, y ya los has visto muchas veces en los capítulos que preceden a éste. Puesto que los objetos son tan importantes para el lenguaje JavaScript, es importante que entiendas cómo funcionan en detalle, y este capítulo te proporciona ese detalle. Comienza con una visión general formal de los objetos y, a continuación, se sumerge en secciones prácticas sobre la creación de objetos y la consulta, configuración, eliminación, comprobación y enumeración de las propiedades de los objetos. Estas secciones centradas en las propiedades van seguidas de otras que explican cómo ampliar, serializar y definir métodos importantes en los objetos. Por último, el capítulo concluye con una larga sección sobre la nueva sintaxis literal de objetos en ES6 y versiones más recientes del lenguaje.
6.1 Introducción a los objetos
Un objeto es un valor compuesto: agrega varios valores (valores primitivos u otros objetos) y te permite almacenar y recuperar esos valores por su nombre. Un objeto es una colección desordenada depropiedades, cada una de las cuales tiene un nombre y un valor. Los nombres de las propiedades suelen ser cadenas (aunque, como veremos en§6.10.3, los nombres de las propiedades también pueden ser Símbolos), por lo que podemos decir que los objetos mapean cadenas a valores. Este mapeo de cadenas a ...
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