JS Editor
The JavaScript editor runs console programs in an isolated worker. Paste code, inspect it, then explicitly select Run.
Where to run this
This example uses the JavaScript console playground. Select Run to execute it; the example does not run on this lesson page.
A practical example
const places = [3, 5, 0];
console.log(places.filter(count => count > 0));
What happens
The output contains the two positive counts.