September 2024
Intermediate to advanced
298 pages
7h 23m
Spanish
Content preview from Aprender patrones de diseño de JavaScript, 2ª edición
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Capítulo 9. Patrones de programación asíncrona
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Programación asíncrona en JavaScript te permite ejecutar tareas de larga duración en segundo plano, al tiempo que permite al navegador responder a eventos y ejecutar otro código para gestionar estos eventos. La programación asíncrona es relativamente nueva en JavaScript, y la sintaxis para soportarla no estaba disponible cuando se publicó la primera edición de este libro.
Conceptos de JavaScript como promise, async, y await hacen que tu código sea más ordenado y fácil de leer sin bloquear el hilo principal. Las funciones async se introdujeron como parte de ES7 en 2016 y ahora son compatibles con todos los navegadores. Veamos algunos patrones que utilizan estas funciones para estructurar los flujos de nuestra aplicación.
Programación asíncrona
En JavaScript, el código síncrono se ejecuta de forma bloqueante, lo que significa que el código se ejecuta en serie, una sentencia cada vez. El código siguiente sólo puede ejecutarse una vez finalizada la ejecución de la sentencia actual. Cuando llames a una función síncrona, el código dentro de esa función se ejecutará de principio a fin antes de que el control vuelva al llamante.
Por otra parte, el código asíncrono se ejecuta de forma no bloqueante, lo que significa que el motor de JavaScript puede pasar a ejecutar este código en segundo plano mientras el código que se está ...
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