September 2024
Intermediate to advanced
328 pages
8h 14m
Spanish
Content preview from Programación funcional con C#
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Capítulo 7. Flujo funcional
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Las llamadas a sistemas externos, como bases de datos y API web, son un auténtico coñazo, ¿verdad? Antes de utilizar tus datos -la parte más importante de la función que estás escribiendo- tienes que hacer lo siguiente:
-
Captura y gestiona las excepciones. ¿Quizá la red estaba fallando, o el servidor de la base de datos estaba desconectado?
-
Comprueba que lo que ha llegado de la base de datos no es
null. -
Comprueba que hay un conjunto de datos real y razonable, aunque no sea
null.
Esto conlleva un montón de tediosa repetición, que se interpone en el camino de tu lógica empresarial.
El uso de la DU Maybe del capítulo anterior ayudará en cierta medida a devolver algo distinto de null en el caso de registros no encontrados o errores encontrados, pero incluso en ese caso sigue siendo necesaria la repetición.
¿Y si te dijera que hay una forma de no tener que volver a ver nunca más una excepción no controlada? No sólo eso, sino que ni siquiera necesitarías volver a utilizar un bloque try/catch. ¿Y las comprobaciones de null? Olvídalas. Tampoco tendrás que hacerlo nunca más.
¿No me crees? Pues ponte cómodo; voy a presentarte una de mis funciones favoritas de FP. La utilizo todo el tiempo en mi trabajo diario, y espero que después de leer este capítulo, tú también lo hagas.
Tal vez, revisitado
Me gustaría volver a visitar ahora ese Maybe ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.