September 2024
Intermediate to advanced
138 pages
2h 54m
Spanish
Content preview from Aprender programación funcional
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Capítulo 5. Más sobre la inmutabilidad
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Hemos visto lo importante que es la inmutabilidad para la FP. Este capítulo se centra en una serie de técnicas que ayudan a promover la inmutabilidad. Entre ellas están la recursividad, las funciones de orden superior y la combinación de monoides con funciones de orden superior. Incluimos en el capítulo un nuevo patrón, llamado Monoide y Pliegue, que representa muchos tipos de funciones aparentemente diferentes pero en realidad muy similares. Comencemos el capítulo con una discusión sobre las variables mutables e inmutables.
Nota
La inmutabilidad es una propiedad clave en el código funcional. Cuanto menos estado mutable tenga un programa, menos tendrá que tener en cuenta el programador al escribir el programa. Un gran número de errores de programación se deben a que el programador no es capaz de tener en mente una gran cantidad de detalles cambiantes a la vez. El estado cambiante provoca una complejidad que debemos rastrear y gestionar.
Variables mutables e inmutables
Casi todos los lenguajes de programación permiten crear una variable, establecer su valor y cambiarlo posteriormente. Para ver un ejemplo de uno que no permite esto, fíjate en Haskell. Una variable que puede modificarse después de haber sido establecida se denomina variable mutable.
Nota
En la programación imperativa y orientada a objetos, las variables mutables ...
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