Io - Programming language

Io is a programming language created in 2002 by Steve Dekorte.

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Try now: Riju · TIO

Io is a pure object-oriented programming language inspired by Smalltalk, Self, Lua, Lisp, Act1, and NewtonScript. Io has a prototype-based object model similar to the ones in Self and NewtonScript, eliminating the distinction between instance and class. Like Smalltalk, everything is an object and it uses dynamic typing. Read more on Wikipedia...

Io website
Io Wikipedia page
Io docs
There are at least 2,062 Io repos on GitHub
Io first developed in https://github.com/IoLanguage
file extensions for Io include io
Io on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 594 users using Io in 624 repos on GitHub
Explore Io snippets on Rosetta Code
Io on HOPL
Pygments supports syntax highlighting for Io
GitHub supports syntax highlighting for Io
iolanguage.org was registered in 2009
See also: (7 related languages)Smalltalk, NewtonScript, Self, Lua, Lisp, Python, Ioke
Read more about Io on the web: 1.

Example from Riju:

"Hello, world!" println

Example from hello-world:

"Hello World\n" print

Example from Wikipedia:

factorial := method(n,
    if(n == 0, return 1)
    res := 1
    Range 1 to(n) foreach(i, res = res * i)
)

Feature	Supported	Token	Example
MultiLine Comments	✓
Integers	✓		// \d+
Floats	✓		// (\d+\.?\d\|\d\.\d+)([eE][+-]?[0-9]+)?
Assignment	✓	:=
Print() Debugging	✓	print
Line Comments	✓	//	// A comment
Operator Overloading	✓
Comments	✓
Semantic Indentation	X

Io

Io - Programming language

Language features