RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including circular-iterator. Try it out:
/* eslint no-console: 0 */
const circularIterator = require('circular-iterator');
const iterator = circularIterator([1, 2, 3]);
console.log(iterator.next().value); //1
console.log(iterator.next().value); //2
console.log(iterator.next().value); //3
console.log(iterator.next().value); //1
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require()any package directly from npm- use arrow functions, classes, template strings, and most of ES6
awaitany promise instead of using callbacks (example)- create your own embedded node.js snippets
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