November 2024
Intermediate to advanced
802 pages
19h 26m
French
Content preview from Manuel de cuisine Scala, 2e édition
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Chapitre 1. Tâches en ligne de commande
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Il est fort probable que l'une des premières étapes de ton voyage dans Scala 3 consiste à travailler en ligne de commande. Par exemple, après avoir installé Scala comme indiqué dans la section "Installation de Scala", tu voudras peut-être lancer le REPL (Read/Eval/Print/Loop) de Scalaen tapant scala sur la ligne de commande de ton système d'exploitation. Tu peux aussi créer un petit projet "Hello, world" en un seul fichier, puis le compiler et l'exécuter. Comme c'est par ces tâches en ligne de commande que de nombreuses personnes commenceront à travailler avec Scala, elles sont abordées ici en premier.
La REPL est un shell de ligne de commande. C'est un espace de jeu où tu peux effectuer de petits tests pour voir comment Scala et ses bibliothèques tierces fonctionnent. Si tu connais le JShell de Java, le irb de Ruby, le shell de Python ou IPython, ou encore le ghci de Haskell, la REPL de Scala est similaire à toutes ces interfaces. Comme le montre la figure 1-1, il suffit de lancer la REPL en tapant scala sur la ligne de commande de ton système d'exploitation, puis de taper tes expressions Scala, qui seront évaluées dans l'interpréteur de commandes.
Chaque fois que tu veux tester du code Scala, la REPL est un formidable environnement de jeu. Il n'est pas nécessaire de créer un projet complet - il suffit de mettre ...
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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.