Kotlin — Hello World
The classic hello-world in Kotlin — a top-level main function — for testing highlighters, the Kotlin compiler, and parsers.
// The classic first program, in Kotlin.
fun main() {
println("Hello, world!")
}
Specifications
- Language
- Kotlin
- Kind
- hello-world
- Lines
- 4
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Compile the file with kotlinc and run it.
- Expected result
- It compiles with no warnings and prints exactly `Hello, world!`. `main` is a top-level function with no parameters, which requires Kotlin 1.3 or later.
What is a .kt file?
Kotlin (.kt) is a plain-text source file for the Kotlin programming language — a statically typed, JVM language from JetBrains that interoperates with Java. It is the preferred language for modern Android development and features null safety, data classes, extension functions, and concise syntax.
How to use this file
Use an example .kt file to test syntax highlighters, the Kotlin compiler, linters and formatters (ktlint), and parser or language-detection tooling.
How to use this file for testing
“Kotlin — 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: Kotlin · 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
kotlinc HelloWorld.kt -include-runtime -d app.jar && java -jar app.jarRelated files
- ktKotlin — Order model (data classes, sealed types, when)A realistic Kotlin snippet with data classes, an enum, a sealed result interface, extension functions, and when expressions — for testing highlighters, the Kotlin compiler, ktlint, and parsers.
- ktKotlin Data ClassKotlin data class SAMPLE for Kotlin language-server 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.
- 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.