A language concept that uses UML Class Diagram notation for the visibility and types, so + is public, - is private, # is protected, / is derived, _ is static, and ~ is a package. It's indentation based like Python and F#, and a block starts with a =. The only difference between a variable a class and a method, is that classes have members and me…

Concept.txt

~ com.wausoft.test =
    + _ Program =
        + main(args: Array[String]): Unit = // unit is equivalent to void
            printfn("this is a test")

            - res = add(2, 4) // type inferred to int

            printfn("result: $res") // example of string interpolation

        + add(a: Int, b: Int): Int = a + b


    + Person =
        - name = "" // type inferred to string
        - age = 0 // type inferred to int

        + init(nm: String, ag = Int): Person =
            name = nm
            age = ag

        + birthday(): Unit = age += 1
        + new_name(nm: String): Person = new Person(nm, age)