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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-array/has-key. Try it out:
const array = require('extra-array');
var x = [10, 20, 30];
array.hasKey(x, 2);
array.hasKey(x, 3);
array.hasKey(x, -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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