Ruby — Hello World
The classic hello-world in Ruby — a single puts — for testing highlighters, the Ruby interpreter, and parsers.
# The classic first program, in Ruby.
puts "Hello, world!"
Specifications
- Language
- Ruby
- Kind
- hello-world
- Lines
- 2
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Run the file with the Ruby interpreter and capture stdout.
- Expected result
- It prints exactly `Hello, world!` and a newline. The file is two lines - a comment and a single `puts` - with no shebang, so it must be invoked as `ruby hello-world.rb` rather than executed directly.
What is a .rb file?
Ruby (.rb) is a plain-text source file for the Ruby programming language — a dynamically typed, object-oriented scripting language known for expressive, readable syntax and blocks. Everything is an object, and it is widely used for web development (Rails), scripting, and automation.
How to use this file
Use an example .rb file to test syntax highlighters, the Ruby interpreter, linters and formatters (RuboCop), and parser or language-detection tooling.
How to use this file for testing
“Ruby — Hello World” is a deterministic Novus Examples fixture for Syntax highlighting, Code parsing, Editor testing. Idiomatic hello-world programs and realistic snippets across sixteen languages, exercising comments, string escapes, interpolation, numeric literals, and language keywords — for testing syntax highlighters, editor themes, and tree-sitter grammars.
Documented properties for this file: Ruby · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This is a short, known-correct source file. Run it through your syntax highlighter, linter, formatter, tree-sitter grammar, or parser, and open it in the in-browser editor to tweak and re-download. Each snippet exercises comments, string escapes, literals, and language keywords.
Code examples
ruby hello-world.rbRelated files
- rbRuby — Stack (Enumerable, blocks, custom error)A realistic Ruby snippet: a Stack class that mixes in Enumerable, yields blocks, raises a custom error class, and uses string interpolation and symbol-to-proc — for testing highlighters, RuboCop, and parsers.
- rbRuby Lint Invalid — Rescue All InvalidIntentionally lint-bait SAMPLE ruby snippet (rescue-all-invalid) for rule-engine tests.
- rbRuby ModuleRuby nested module SAMPLE for parser tests.
- cC — Hello WorldThe classic hello-world in C — an include, main, and printf — for testing highlighters, C compilers, and parsers against the canonical first program.
- cC — Linked list (structs, malloc, pointers)A realistic C program: a singly linked list with a typedef struct, malloc/free memory management, pointer walking, and error handling — for testing highlighters, compilers, and static analysers.
- cC StructC struct SAMPLE for clangd / highlighter fixtures.
Generated by generation/code_samples.py. Free for any use, no attribution required — license.