Swift — Hello World
The classic hello-world in Swift — a single print — for testing highlighters, the Swift compiler, and parsers.
// The classic first program, in Swift.
print("Hello, world!")
Specifications
- Language
- Swift
- Kind
- hello-world
- Lines
- 2
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Compile the file with swiftc and run it.
- Expected result
- It compiles with no warnings and prints exactly `Hello, world!`. The file is two lines with no `main` function - Swift's top-level-code rule applies, which holds only for a file named main.swift or compiled as a script.
What is a .swift file?
Swift (.swift) is a plain-text source file for the Swift programming language — a statically typed, compiled language from Apple used for iOS, macOS, and server development. It emphasises safety with optionals and value types, and features structs, protocols, generics, and pattern matching.
How to use this file
Use an example .swift file to test syntax highlighters, the Swift compiler, linters and formatters (SwiftLint, swift-format), and parser or language-detection tooling.
How to use this file for testing
“Swift — 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: Swift · 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
swift hello-world.swiftRelated files
- swiftSwift — Task list (struct, protocol, optionals)A realistic Swift snippet with an enum, a protocol, a struct with a computed property, optionals and optional binding, and higher-order functions — for testing highlighters, the Swift compiler, SwiftLint, and parsers.
- swiftSwift StructSwift struct SAMPLE for SourceKit fixtures.
- 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.
- csC# FibonacciA small C# iterator Fibonacci utility — realistic snippet for language tooling.
Generated by generation/code_samples.py. Free for any use, no attribution required — license.