qjs.com

QuickJS JavaScript Engine

QuickJS is a small and embeddable JavaScript engine. It comes with an interactive command-line interface with contextual colorization.

The source code for qjs.com can be found in the third_party/quickjs folder.

Build Instructions

git clone https://github.com/jart/cosmopolitan && cd cosmopolitan
build/bootstrap/make.com o//third_party/quickjs/qjs.com
./o/third_party/quickjs/qjs.com

Usage Examples

Run and test the interpreter:

$ o/third_party/quickjs/qjs.com
QuickJS - Type "\h" for help
qjs >: console.log(2+2)
4
undefined
qjs >:

Print 10 numbers from the Fibonacci sequence:

qjs >: let a = 0, b = 1, temp; for (let i = 0; i<9; i++) { console.log(a); temp = a+b; a=b; b=temp; }
0
1
1
2
3
5
8
13
21
34

Documentation

• Official documentation
  • Mirrored in the repo
• TypeScript declarations for the QuickJS runtime