Some implementations don't define console, so this wouldn't work in some (for example, Rhino). Something like this would be more universal: if (typeof con

Some implementations don't define console, so this wouldn't work in some (for example, Rhino). Something like this would be more universal: if (typeof console === 'object') { console.log('Hello, World!'); } else if (typeof document === 'object') { document.write('Hello, World!'); } else { print('Hello, World!'); } http://progopedia.com/implementation/rhino/ http://progopedia.com/implementation/rhino/