Type views

data Name as Type defines a view over an existing storage type:

data Score as int

func main() {
    var score: Score = 10 as Score
    print((score as int) + 5)
}

Score uses integer storage. score as int reads through the original type. as changes the compiler's type view while preserving the data layout.

Use a type view to name an existing representation. Use typealias int as Score when you only need another name for an existing type.

The current development compiler reports a type conversion error when calling view instance methods. Use ordinary data for models with fields and methods. See Data templates.