Ceylon - Programming language

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

#291on PLDB

13Years Old

336Repos

Download source code:

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

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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...

Tags: programming language
Ceylon is developed on GitHub and has 396 stars
There are at least 336 Ceylon repos on GitHub
Early development of Ceylon happened in Red Hat
Ceylon is written in Java, JavaScript, XML, XSLT, Bourne shell, Gradle, Markdown, HTML, Groovy, CSS, DTD, JSON, Ini, Bash, Make, AsciiDoc, Perl, YAML
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!");
}

Language features

Feature	Supported	Example	Token
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