November 2024
Intermediate to advanced
324 pages
8h 6m
French
Content preview from Programmation TypeScript
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Chapitre 3. Tout sur les types
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Dans le dernier chapitre, j'ai introduit l'idée des systèmes de types, mais je n'ai jamais défini ce que signifie vraiment le type dans système de types.
Si cela te semble confus, laisse-moi te donner quelques exemples familiers :
-
Le type
booleanest l'ensemble de tous les booléens (il n'y en a que deux :trueetfalse) et des opérations que tu peux effectuer sur eux (comme||,&&, et!). -
Le type
numberest l'ensemble de tous les nombres et des opérations que tu peux effectuer sur eux (comme+,-, *,/,%,||,&&, et?), y compris les méthodes que tu peux appeler sur eux comme.toFixed,.toPrecision,.toString, et ainsi de suite. -
Le type
stringest l'ensemble de toutes les chaînes de caractères et des opérations que tu peux effectuer sur elles (comme+,||, et&&), y compris les méthodes que tu peux appeler sur elles comme.concatet.toUpperCase.
Lorsque tu vois que quelque chose est de type T, non seulement tu sais que c'est un T, mais tu sais aussi exactement ce que tu peux faire avec ce T (et ce que tu ne peux pas faire). N'oublie pas que le but est d'utiliser le vérificateur de caractères pour t'empêcher de faire des choses non valables. Et la façon dont le vérificateur de caractères sait ce qui est valide et ce qui ne l'est pas, c'est en ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.