REBOL

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REBOL, aka Relative Expression-Based Object Language, is an open source programming language created in 1997 by Carl Sassenrath.

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Rebol ( REB-əl; historically REBOL) is a cross-platform data exchange language and a multi-paradigm dynamic programming language designed by Carl Sassenrath for network communications and distributed computing. It introduces the concept of dialecting: small, optimized, domain-specific languages for code and data, which is also the most notable property of the language according to its designer Carl Sassenrath: Although it can be used for programming, writing functions, and performing processes, its greatest strength is the ability to easily create domain-specific languages or dialects Douglas Crockford, known for his involvement in the development of JavaScript, has described Rebol as "a more modern language, but with some very similar ideas to Lisp, in that it's all built upon a representation of data which is then executable as programs" and as one of JSON's influences. Originally, the language and its official implementation were proprietary and closed source, developed by REBOL Technologies. Read more on Wikipedia...

REBOL website
REBOL Wikipedia page
REBOL docs
There are at least 30,469 REBOL repos on GitHub
REBOL first developed in REBOL Technologies
file extensions for REBOL include r, reb, r2, r3 and rebol
The Google BigQuery Public Dataset GitHub snapshot shows 2k users using REBOL in 2k repos on GitHub
There are 15 Project Euler users using REBOL
Explore REBOL snippets on Rosetta Code
REBOL on HOPL
REBOL appears in the TIOBE Index
Pygments supports syntax highlighting for REBOL
GitHub supports syntax highlighting for REBOL
Indeed.com has 0 matches for "rebol developer".
rebol.com was registered in 1997
See also: (11 related languages)Self, Forth, Lisp, Logo, JSON, Red, JavaScript, C, Algol, S-expressions, PEG

Example from Riju:

REBOL [Title: "Main"]
print "Hello, world!"

Example from hello-world:

print "Hello World"

Example from the Hello World Collection:

; Hello World in REBOL

print "Hello World!"

Example from Linguist:

Rebol []
hello: func [] [
    print "hello, world!"
]
hello

Example from Wikipedia:

Digit: charset [#"0" - #"9"]
Value: [some Digit | "(" Expr ")"]
Product: [Value any [["*"| "/"] Value]]
Sum: [Product any [["+"| "-"] Product]]
Expr: Sum
parse/all "12+13" Expr

Feature	Supported	Token	Example
Strings	✓	" { }	"Hello world" {He said "That looks good!"}
Print() Debugging	✓	print probe
Lists	✓		my-list: [1 two 3.0 "four"]
Line Comments	✓	;	; A comment
Homoiconicity	✓
Garbage Collection	✓
Exceptions	✓		catch [throw 22 print "You'll never see this."] try/except [read %does_not_exist] [print "File not found"]
Comments	✓
Disk Output	✓		write %helloworld.txt "Hello, world!^/"
Semantic Indentation	X

REBOL - Programming language

Language features