js113 B
JavaScript — Hello World
The classic hello-world in modern JavaScript — a minimal function calling console.log, for testing highlighters, Node, and JS parsers.
Preview — first 7 linesjs
// The classic first program, in modern JavaScript.
function main() {
console.log("Hello, world!");
}
main();
Specifications
- Language
- JavaScript
- Kind
- hello-world
- Lines
- 6
- Encoding
- UTF-8
- Line Endings
- LF
What is a .js file?
JavaScript (.js) is a plain-text source file for the JavaScript language — the scripting language of the web, also used server-side via Node.js. It is dynamically typed and event-driven, with first-class functions, prototypes, and (in modern syntax) modules, classes, and async/await.
How to use this file
Use an example .js file to test syntax highlighters, linters (ESLint), formatters (Prettier), bundlers, and JavaScript parsers, or as editor and diff-viewer fixtures.
Related files
- jsJavaScript — To-do list (class, private fields, async)A realistic JavaScript snippet with an ES class, private #fields, arrow functions, template literals, a getter, and async/await — for testing highlighters, ESLint, Prettier, and bundlers.
- 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.
- cppC++ — Hello WorldThe classic hello-world in C++ — iostream and std::cout — for testing highlighters, C++ compilers, and parsers.
- cppC++ — Series (class template, STL)A realistic C++ snippet with a class template, STL algorithms (max_element, accumulate), std::move, and range handling — for testing highlighters, g++/clang++, and parsers against real templates.
- cssCSS — Component styles (variables, flexbox, keyframes)A realistic component stylesheet using custom properties, flexbox, a fluid clamp() font size, color-mix(), a keyframe animation, and a media query — for testing CSS parsers, linters (stylelint), and highlighters.
Generated by generation/code_samples.py. Free for any use, no attribution required — license.