November 2024
Intermediate to advanced
372 pages
9h 2m
French
Content preview from Maîtriser la brillance
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Chapitre 15. Blocs de construction réactifs
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Maintenant que tu connais la théorie qui sous-tend le graphe réactif et que tu as acquis une certaine expérience pratique, c'est le bon moment pour parler plus en détail de la façon dont la réactivité s'intègre dans R, le langage de programmation. La programmation réactive repose sur trois éléments fondamentaux : les valeurs réactives, les expressions réactives et les observateurs. Tu as déjà vu la plupart des éléments importants des valeurs et des expressions réactives, c'est pourquoi ce chapitre s'attarde sur les observateurs et les sorties (qui, comme tu l'apprendras, sont un type spécial d'observateur). Tu apprendras également deux autres outils pour contrôler le graphe réactif : l'isolation et l'invalidation temporelle.
Ce chapitre utilisera à nouveau la console réactive afin que nous puissions expérimenter la réactivité directement dans la console sans avoir à lancer une appli Shiny à chaque fois. Pour commencer, nous allons charger shiny et activer la réactivité pour une expérimentation interactive :
library(shiny)reactiveConsole(TRUE)
Valeurs réactives
Il existe deux types de valeurs réactives :
-
Une seule valeur réactive, créée par
reactiveVal() -
Une liste de valeurs réactives, créée par
reactiveValues()
Ils ont des interfaces légèrement différentes pour obtenir et définir des valeurs :
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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.
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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.