My First Playground

node v8.11.4
version: 4.0.1
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This is a playground to test JavaScript. It runs a completely standard copy of Node.js on a virtual server created just for you. Every one of npm’s 300,000+ packages are pre-installed, so try it out:
const makeSealer = () => { let open = null return { seal(value) { const box = () => open === box && value return box }, unseal(box) { open = box const result = box() open = null return result }, } } const s = makeSealer() const o = {a: 1} const box = s.seal(o) console.log(s.unseal(box)) console.log(s.unseal(() => {}))
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