November 2024
Intermediate to advanced
802 pages
19h 26m
French
Content preview from Manuel de cuisine Scala, 2e édition
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Chapitre 14. Collections : Utilisation des cartes
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Les types Scala Map sont semblables aux dictionnaires Java Map, Ruby Hash, ou Python, en ce sens qu'ils sont constitués de paires clé/valeur, et que les valeurs des clés doivent être uniques. La recette 14.1 présente les bases de la création et de l'utilisation des cartes immuables et mutables.
Après cette introduction aux cartes, la recette 14.2 t'aide à choisir une implémentation de carte pour les cas où tu dois utiliser des caractéristiques spéciales de carte. Ensuite, les recettes 14.3 et 14.4 couvrent les processus d'ajout, de mise à jour et de suppression d'éléments dans les cartes immuables et mutables, respectivement.
Si tu viens de Java à Scala, une grande différence avec les cartes est que le site Map par défaut en Scala est immuable, donc si tu n'as pas l'habitude de travailler avec des collections immuables, cela peut être une grande surprise lorsque tu essaies d'ajouter, de supprimer ou de modifier des éléments dans la carte.
Outre l'ajout, la suppression et le remplacement d'éléments de carte, d'autres tâches courantes liées aux cartes consistent à travailler avec leurs clés et leurs valeurs (voir les recettes 14.5 à 14.8), ainsi qu'à parcourir(recette 14.9), trier(recette 14.10) et filtrer(recette 14.11) les cartes.
14.1 Créer et utiliser des cartes
Problème
Tu veux créer et utiliser ...
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