Allow to declare directly `val` in the `if` statement and use in body

Language Design
1

First of all, Kotlin is awesome!

Second, it’d be cool if we could have something similar to smart cast, that is declaring a val (thread safe) inside the if statement and use it directly in the body

if( val email = client?.personalInfo?.email != null && message!=null) mailer.sendMessage(email, message)

2

I’m not really a language expert, but that just seems harder to read while you’re only saving one line of code. I’d prefer putting the email initialization right above that.

3

You can use the let function for this purpose:

client?.personalInfo?.email?.let { email -> 
  if (message != null) mailer.sendMessage(email, message)
}
3 Likes