November 2024
Intermediate to advanced
802 pages
19h 26m
French
Content preview from Manuel de cuisine Scala, 2e édition
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Chapitre 7. Objets
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Dans la continuité des chapitres sur la modélisation du domaine, le mot objet a une double signification en Scala. Comme avec Java, tu utilises le nom pour faire référence à une instance d'une classe, mais dans Scala, object est beaucoup plus connu en tant que mot-clé. Ce chapitre présente les deux significations du mot.
Les deux premières recettes considèrent un objet comme une instance d'une classe. Elles montrent comment couler des objets d'un type à un autre et démontrent l'équivalent en Scala de l'approche .class de Java.
Les autres recettes montrent comment le mot-clé object est utilisé à d'autres fins. Dans son utilisation la plus élémentaire, la recette 7.3 montre comment l'utiliser pour créer des singletons. La recette 7.4 montre comment utiliser les objets compagnons pour ajouter des membres statiques à une classe, puis la recette 7.5 montre comment utiliser les méthodes apply dans les objets compagnons comme moyen alternatif de construire des instances de classe.
Après ces recettes, la recette 7.6 montre comment créer une fabrique statique à l'aide d'un object, et la recette 7.7 montre comment combiner un ou plusieurs traits dans un objet dans un processus techniquement connu sous le nom de réification. Enfin, le pattern matching est un sujet très important pour Scala, et la recette 7.8 montre comment écrire une méthode ...
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