On: Swift is like Kotlin

[Unknoob]

The article is missing the similarities between Swift Optionals and Kotlin Nullables.

Swift code:

  var name: String?

  name? ///returns a safe value
  name! ///returns an unsafe value and throws an exception in case of a nil value

  if name != nil {
   ///Now we can use name! forcing unwrap because we know it's not nil
  }

  if let unwrapedName = name {
   /// Here we can use unwrapedName without forcing the unwrap
  }

The null checks are almost the same in Kotlin: https://kotlinlang.org/docs/reference/null-safety.html

[jorgemf → Unknoob]

kotlin make it a bit simpler, once you do name != null you can use it as it is never null after than, there is not need to use let. It makes it more readable.

[flaie → Unknoob]

In kotlin you can also write:

    var name: String?
    // some code
    name?.let {
        // here name is not nil and can be accessed via variable "it"
    }
    // or 
    name?.let { name ->
        // here name shadows the previous variable, and is not nil
    }