Fantom

Fantom is an open source programming language created in 2005.

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Fantom is a general purpose object-oriented programming language created by Brian and Andy Frank that runs on the Java Runtime Environment (JRE), JavaScript, and the .NET Common Language Runtime (CLR) (.NET support is considered "prototype" status). Its primary design goal is to provide a standard library API that abstracts away the question of whether the code will ultimately run on the JRE or CLR. Like C# and Java, Fantom uses a curly brace syntax. Read more on Wikipedia...

Fantom website
Fantom Wikipedia page
Fantom docs
There are at least 176 Fantom repos on GitHub
Fantom first developed in https://github.com/fantom-lang
file extensions for Fantom include fan
The Google BigQuery Public Dataset GitHub snapshot shows 36 users using Fantom in 38 repos on GitHub
Explore Fantom snippets on Rosetta Code
Fantom appears in the TIOBE Index
Pygments supports syntax highlighting for Fantom
GitHub supports syntax highlighting for Fantom
fantom.org was registered in 2003
See also: (11 related languages)C#, Java, Scala, Ruby, Erlang, JavaScript, Boo, Ceylon, Gosu, Groovy, Kotlin

Example from hello-world:

// Hello from Fantom!
class HelloWorld {
  static Void main() {
    echo("Hello World")
  }
}

Example from Linguist:

/*
 * Author: Robert Koeninger
 * License: WTFPL (http://www.wtfpl.net/)
 */

mixin Expr
{
  abstract Obj? eval()
}

class Constant : Expr
{
  Obj? value

  new make(Obj? value) { this.value = value }
  override Obj? eval() { value }
}

enum class Op
{
  plus,
  minus
}

class Infix : Expr
{
  Op op
  Expr left
  Expr right

  new make(Op op, Expr left, Expr right)
  {
    this.op = op
    this.left = left
    this.right = right
  }

  override Obj? eval()
  {
    switch (op)
    {
      case Op.plus:
        return (Int)left.eval() + (Int)right.eval()
      case Op.minus:
        return (Int)left.eval() - (Int)right.eval()
      default:
        throw Err("undefined Op")
    }
  }
}

Example from Wikipedia:

// Hello from Fantom!
class HelloWorld
{
  static Void main()
  {
    echo("Hello, World!")
  }
}

Feature	Supported	Token	Example
Strings	✓	"	"Hello world"
MultiLine Comments	✓	/* */	/* A comment */
Print() Debugging	✓	echo
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Semantic Indentation	X

Fantom - Programming language

Language features