Ceylon

Ceylon is an open source programming language created in 2011 by Gavin King.

Source code:

git clone https://github.com/eclipse/ceylon

#224on PLDB

13Years Old

336Repos

Try now: Riju · TIO

Ceylon is an object-oriented, strongly statically typed programming language with an emphasis on immutability, created by Red Hat. Ceylon programs run on the Java virtual machine (JVM), and can be compiled to JavaScript. The language design focuses on source code readability, predictability, toolability, modularity, and metaprogrammability. Read more on Wikipedia...

Ceylon website
Ceylon Wikipedia page
Ceylon is developed on GitHub and has 387 stars
Ceylon docs
There are at least 336 Ceylon repos on GitHub
Ceylon first developed in Red Hat
file extensions for Ceylon include ceylon, ceyloncite and web
Ceylon is written in Java
Ceylon on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 85 users using Ceylon in 167 repos on GitHub
There are 8 Project Euler users using Ceylon
Explore Ceylon snippets on Rosetta Code
Ceylon appears in the TIOBE Index
Ceylon LSP implementation
Pygments supports syntax highlighting for Ceylon
GitHub supports syntax highlighting for Ceylon
ceylon-lang.org was registered in 2011
See also: (11 related languages)JVM, JavaScript, Java, Scala, Smalltalk, ML, Lisp, Apache Maven, TypeScript, Dart, Fantom

Example from Riju:

shared void run() {
    print("Hello, world!");
}

Example from hello-world:

shared void hello() {
    print("Hello World");
}

Example from the Hello World Collection:

// Hello world in Ceylon

print("Hello, World!");

Example from Linguist:

"Test function for Ceylon"
by ("Enrique")
shared void test() {
    print("test");
}

"Test class for Ceylon"
shared class Test(name) satisfies Comparable<Test> {
    shared String name;
    shared actual String string = "Test ``name``.";

    shared actual Comparison compare(Test other) {
        return name<=>other.name;
    }
}

Example from Wikipedia:

/* The classic Hello World program */
shared void run() {
    print("Hello, World!");
}

Feature	Supported	Token	Example
Binary Literals	✓		// \$([01]{4})(_[01]{4})+
Integers	✓		// \d{1,3}(_\d{3})+[kMGTP]?
Floats	✓		// \d{1,3}(_\d{3})+\.\d{1,3}(_\d{3})+[kMGTPmunpf]?
Hexadecimals	✓		// #([0-9a-fA-F]{4})(_[0-9a-fA-F]{4})+
Strings	✓	"	"Hello world"
MultiLine Comments	✓	/* */	/* A comment */
Print() Debugging	✓	print
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Type Inference	✓
Static Typing	✓
Operator Overloading	✓
Semantic Indentation	X

Ceylon - Programming language

Language features