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The Problem Imagine that you're building an app and somewhere in your code you write something like this: class DoFinanceStuff(cc: CreditCardService): def grabClientMoney(card: CardData) = val amount = // ... // ... cc.processPayment...
The Tip The Scala collections library defines an Iterator trait. As you might expect, a typical Iterator's implementation relies on mutable state. And so for the today's tip: Beware of leaking Iterator instances outside the scope you initialized it ...
Given this class: case class User( id: UserId, email: Option[Email], address: Option[Address], posts: Option[List[Post]], lastLogin: Option[Timestamp]) What does Option on each of the fields actually means? Well, after spending hours diggi...