Scheme - Programming language

Scheme is a programming language created in 1975 by Guy Steele and Gerald Jay Sussman.

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Scheme is a functional programming language and one of the two main dialects of the programming language Lisp. Unlike Common Lisp, the other main dialect, Scheme follows a minimalist design philosophy specifying a small standard core with powerful tools for language extension. Scheme was created during the 1970s at the MIT AI Lab and released by its developers, Guy L. Read more on Wikipedia...

Tags: programming language, lisp
There are at least 16,742 Scheme repos on GitHub
Early development of Scheme happened in https://community.scheme.org/
The Google BigQuery Public Dataset GitHub snapshot shows 5k users using Scheme in 7k repos on GitHub
There are 817 Project Euler users using Scheme
Explore Scheme snippets on Rosetta Code
Scheme on HOPL
Scheme appears in the TIOBE Index
Scheme Ubuntu package
CodeMirror package for syntax highlighting Scheme
Monaco package for syntax highlighting Scheme
Pygments supports syntax highlighting for Scheme
GitHub supports syntax highlighting for Scheme
Scheme appears in the Quine Relay project
Learn Scheme on exercism.
There is 1 Jupyter Kernel for Scheme
Events page for Scheme
Indeed.com has 1,174 matches for "scheme engineer".
scheme-reports.org was registered in 2009
See also: (27 related languages) T, Lisp, Algol, Clojure, Common Lisp, Dylan, EuLisp, Haskell, JavaScript, Julia, Lua, R, S, Racket, Ruby, Rust, Scala, PLANNER, Ikarus Scheme implementation, Larceny Scheme implementation, Unicode, S-expressions, Fortran, C, Guile, Emacs Lisp, Android
45 PLDB concepts link to Scheme: Ace Editor, atomspace, Bio, Carbon, carth, CHICKEN, chisel, CIR, cloc, co2, Eiffel, femtolisp, firrtl, Flare, Gforth, Guix Workflow Language, Hare, harlan, Idio, Idris, JAL compiler, JavaScript, Julia, Lux, mal, minikanren, Node.js, Particles, GNU Poke, Pre-Scheme, Pycket, Pygments, Racket, rainbow, Ruby, Scheme 48, Slideshow, Slope, Spatial, sporth, SymPy, Uniform eXchange Format, v8, Vyxal, Wing

Example from Riju:

(display "Hello, world!")
(newline)

Example from hello-world:

(display "Hello World") (newline)

Example from the Hello World Collection:

; Hello World in Scheme

(display "Hello, world!")
(newline)

Example from Linguist:

(define-library (libs basic)
    (export list2 x)
    (begin
        (define (list2 . objs)  objs)
        (define x 'libs-basic)
        (define not-exported 'should-not-be-exported)
        ))

Example from Wikipedia:

(set! +
      (let ((original+ +))
        (lambda args
          (if (and (not (null? args)) (string? (car args)))
              (apply string-append args)
              (apply original+ args)))))
(+ 1 2 3)
===> 6
(+ "1" "2" "3")
===> "123"

Scheme Keywords

case do let loop if else when cons car cdr cond lambda lambda* syntax-rules format set! quote eval append list list? member? load

Language features

Feature	Supported	Example	Token
Conditionals	✓
Strings	✓	"Hello world"	"
MultiLine Comments	✓	#\| A comment \|#	#\| \|#
Print() Debugging	✓		display
Homoiconicity	✓
Prefix Notation	✓	(+ 1 2 3)
Macros	✓	(define-syntax backwards (syntax-rules () ((_) (syntax-error "(backwards) not allowed")) ((_ e) e) ((_ e1 ... e2) (begin e2 (backwards e1 ...)))))
Line Comments	✓	; A comment	;
Comments	✓
Case Insensitive Identifiers	X
Semantic Indentation	X