September 2024
Intermediate to advanced
706 pages
22h 41m
Spanish
Content preview from JavaScript: La Guía Definitiva, 7ª Edición
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Capítulo 14. Metaprogramación
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Este capítulo de cubre una serie de funciones avanzadas de JavaScript que no se utilizan habitualmente en la programación diaria, pero que pueden ser valiosas para los programadores que escriben bibliotecas reutilizables y de interés para cualquiera que quiera trastear con los detalles sobre cómo se comportan los objetos de JavaScript.
Muchos de los rasgos descritos aquí pueden describirse vagamente como "metaprogramación": si la programación normal es escribir código para manipular datos, la metaprogramación es escribir código para manipular otro código. En un lenguaje dinámico como JavaScript, los límites entre programación y metaprogramación son difusos: incluso la simple capacidad de iterar sobre las propiedades de un objeto con un bucle for/in podría ser considerada "meta" por programadores acostumbrados a lenguajes más estáticos.
Los temas de metaprogramación tratados en este capítulo incluyen:
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§14.1 Controlar la enumerabilidad, eliminabilidad y configurabilidad de las propiedades de los objetos
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§14.2 Controlar la extensibilidad de los objetos y crear objetos "sellados" y "congelados
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§14.3 Consultar y establecer los prototipos de los objetos
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§14.4 Afinar el comportamiento de tus tipos con Símbolos conocidos
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§14.5 Crear DSL (lenguajes específicos de dominio) con funciones de etiquetas de plantilla
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§14.6 Sondear objetos ...
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