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sbt (originally simple build tool, nowadays stands for nothing [4]) is an open-source build tool which can build Java, Scala, and Kotlin projects.It aims to streamline the procedure of constructing, compiling, testing, and packaging applications, libraries, and frameworks.
Scala: Application, general, parallel, distributed, web Yes Yes Yes No Yes Yes Data-oriented programming, metaprogramming De facto standard via Scala Language Specification (SLS) Scheme: Education, general Yes No Yes No No No meta, extensible-syntax De facto 1975-2013, R 0 RS, R 1 RS, R 2 RS, R 3 RS, R 4 RS, R 5 RS, R 6 RS, R 7 RS Small Edition ...
In Scala, all types inherit from a top-level class Any, whose immediate children are AnyVal (value types, such as Int and Boolean) and AnyRef (reference types, as in Java). This means that the Java distinction between primitive types and boxed types (e.g. int vs. Integer) is not present in Scala; boxing and unboxing is completely transparent to ...
In Scala 2, an ADT may be defined with: [citation needed] sealed abstract class Tree extends Product with Serializable object Tree { final case object Empty extends Tree final case class Node ( value : Int , left : Tree , right : Tree ) extends Tree }
Inline vs. prologue – an inline comment follows code on the same line and a prologue comment precedes program code to which it pertains; line or block comments can be used as either inline or prologue
Regular languages are a category of languages (sometimes termed Chomsky Type 3) which can be matched by a state machine (more specifically, by a deterministic finite automaton or a nondeterministic finite automaton) constructed from a regular expression.
But languages which emphasize immutable data can make good use of covariant data types. For example, in all of Scala, Kotlin and OCaml the immutable list type is covariant: List [Cat] is a subtype of List [Animal]. Scala's rules for checking variance annotations are essentially the same as C#'s.
The influence of Scala in Kotlin can be seen in the extensive support for both object-oriented and functional programming [31] and in a number of specific features: there is a distinction between mutable and immutable variables (var vs val keyword) all classes are public and final (non-inheritable) by default