Ceylon – language for writing large programs in teams

Ceylon is an open source language for writing large programs in teams that is influenced by Java. It is a “higher-order” language partly because functions, classes, methods, and attributes are typed values, and provides a typesafe metamodel.

It has a powerful static type system that prevents many bugs while letting you express more, more easily: union types, intersection types, higherorder functions, mixin inheritance, and enumerated types.

It is a whole platform with a modern SDK designed from scratch. It runs on both Java and JavaScript virtual machines, bridging the gap between client and server. Ceylon is fully interoperable with Java and the Java SDK.

Features include:

  • Prioritizes readability, via a highly regular syntax which is derived from C.
  • Support for Java and JavaScript virtual machines.
  • Powerful static type system that prevents many bugs.
  • Declarative syntax for treelike structures.
  • Union types, intersection types, higher order functions, mixin inheritance, and enumerated types.
  • Polymorphic attributes.
  • Type aliases and type inference.
  • Higher-order functions.
  • Tuples – a kind of linked list, where the static type of the list encodes the static type of each element of the list.
  • Declaration-site variance.
  • Rich set of operators, including most of the operators supported by C and Java.
  • Typesafe null and flow-dependent typing.
  • Support for modules.
  • Complete platform with a modern, modular SDK designed from scratch.
  • Compiler produces module archives which are then distributed via a next-generation repository architecture with Ceylon Herd.
  • Complete command line toolset, and a very complete Eclipse based IDE with searching, refactoring, quick fixes and assists, autocompletion, debugging, and more.
  • Interoperability with Maven repositories, so that you can use Maven modules as if they were Ceylon modules.

Developer: Red Hat
License: Apache License v2

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