November 2024
Intermediate to advanced
372 pages
9h 2m
French
Content preview from Maîtriser la brillance
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Chapitre 3. Réactivité de base
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Introduction
Dans Shiny, tu exprimes la logique de ton serveur en utilisant la programmation réactive. La programmation réactive est un paradigme de programmation élégant et puissant, mais il peut être désorientant au début car c'est un paradigme très différent de l'écriture d'un script. L'idée clé de la programmation réactive est de spécifier un graphe de dépendances de sorte que lorsqu'une entrée change, toutes les sorties liées sont automatiquement mises à jour. Cela simplifie considérablement le déroulement d'une application, mais il faut un certain temps pour comprendre comment tout cela s'articule.
Ce chapitre constitue une introduction en douceur à la programmation réactive, en t'enseignant les bases des constructions réactives les plus courantes que tu utiliseras dans les apps Shiny. Nous commencerons par une étude de la fonction serveur, en discutant plus en détail du fonctionnement des arguments input et output. Ensuite, nous examinerons la forme la plus simple de réactivité (où les entrées sont directement connectées aux sorties), puis nous verrons comment les expressions réactives te permettent d'éliminer le travail en double. Nous terminerons en examinant quelques obstacles courants rencontrés par les nouveaux utilisateurs de Shiny.
La fonction serveur
Comme tu l'as vu sur , les éléments essentiels de ...
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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.