Hello, World
(display "Hello, World!")
(newline)main.scm
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main.scm · output appears here
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Scheme 3.0.9Readymain.scmLn 1, Col 1Spaces: 4UTF-8
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main.scm · output appears here
Press Run to execute
Output streams here as your program runs.
Scheme is a minimalist, elegant dialect of Lisp known for its clean design, lexical scoping, first-class procedures, and proper tail calls. Programs are written as S-expressions where code and data share the same parenthesized structure, enabling powerful metaprogramming through macros. Scheme's small core and uniform syntax make it a favorite for teaching programming language concepts, recursion, and functional programming.
CompileBytes runs Scheme using GNU Guile version 3.0, the official extension language of the GNU project. Guile implements modern Scheme standards along with many extensions and a rich standard library. The online environment lets you evaluate S-expressions, define procedures, and experiment with recursion and higher-order functions without installing Guile locally, making it a convenient way to learn and practice idiomatic Scheme.
main.scm is the entry point for each run.
Use the Input panel to pipe standard input to your program when it needs data.
Run sends your code to a fresh hosted runtime and streams the result into the output panel.
Your draft stays in this browser, and Share creates a separate snapshot link.
(display "Hello, World!")
(newline)(define (square x)
(* x x))
(display (square 7))
(newline)(define (factorial n)
(if (= n 0)
1
(* n (factorial (- n 1)))))
(display (factorial 5))
(newline)(define nums '(1 2 3 4 5))
(for-each
(lambda (n)
(display (* n n))
(newline))
nums)(define nums '(1 2 3 4 5))
(display (map (lambda (x) (* x x)) nums))
(newline)
(display (fold-left + 0 nums))
(newline)(define (classify n)
(cond ((> n 0) 'positive)
((< n 0) 'negative)
(else 'zero)))
(let ((x -3))
(display (classify x))
(newline))(define (sum-to n)
(let loop ((i 1) (acc 0))
(if (> i n)
acc
(loop (+ i 1) (+ acc i)))))
(display (sum-to 100))
(newline)(define ages '((alice . 30) (bob . 25)))
(display (assq 'bob ages))
(newline)
(display (cdr (assq 'alice ages)))
(newline)(define nums '(1 2 3 4 5 6 7 8))
(define evens (filter even? nums))
(display evens)
(newline)
(display (length evens))
(newline)The editor uses Monaco, the engine behind VS Code, with language-aware editing tools and familiar keyboard controls.
Type or paste your code into the editor, then click Run (or press Ctrl/Cmd + Enter) to execute it.
Output streams into the console panel, including runtime errors, exit status, and execution time.
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Scheme is one of 46 single-file compiler scratchpads. Each run submits only main.scm; local sibling-file imports are not enabled.
Linked-project languages (23): Node.js, TypeScript, Deno, Python, C, Go, Dart, Swift, Rust, Ruby, PHP, Java, Kotlin, C++, C#, Nim, Crystal, Haxe, Zig, Scala, D, Bun, Objective-C.
Single-file scratchpads (46): Matplotlib, NumPy, pandas, Haskell, Clojure, Perl, Lua, Tcl, jq, Raku, Elixir, Bash, Zsh, Nushell, R, Assembly (NASM), Julia, Octave, Groovy, PowerShell, Visual Basic .NET, Odin, Pascal, Lisp, Erlang, CoffeeScript, COBOL, BASIC, V, Racket, OCaml, Prolog, AWK, Emacs Lisp, Emojicode, Forth, F#, Fortran, Assembly (NASM64), Solidity, Mojo, Ada, WASM (WAT), Gleam, Shell Script (sh), Scheme.
Download file exports the active Scheme source file.