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 @extra-object/is-subobject. Try it out:
const object = require('extra-object');
var x = {a: 1, b: 2, c: 3, d: 4};
var y = {b: 2, d: 4};
object.isSubobject(x, y);
var y = {b: -2, d: -4};
object.isSubobject(x, y);
object.isSubobject(x, y, (a, b) => Math.abs(a) - Math.abs(b));
object.isSubobject(x, y, null, v => Math.abs(v));
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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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