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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 @extra-entries/submaps. Try it out:
const entries = require('extra-entries');
var x = [['a', 1], ['b', 2]];
[...entries.submaps(x)].map(a => [...a]);
var x = [['a', 1], ['b', 2], ['c', 3]];
[...entries.submaps(x)].map(a => [...a]);
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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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