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Copy-ready, tested snippets for Python, Flask, JavaScript, SQL, HTML, CSS and Bash. Open any of them in the playground.

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2 snippets

javascript

Deep clone an object

structuredClone copies nested objects, Dates, Maps and Sets correctly.

const original = { user: { name: "Ada" }, created: new Date(), tags: new Set(["js"]) };
const copy = structuredClone(original);

copy.user.name = "Grace";
console.log(original.user.name);          // Ada (unchanged)

beginner #objects#data

javascript

Group an array by a key

Build an object of arrays with reduce (works everywhere, unlike Object.groupBy).

const orders = [
  { customer: "ada", total: 30 },
  { customer: "linus", total: 12 },
  { customer: "ada", total: 8 },
];

beginner #arrays#data#objects

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Snippet library

Deep clone an object

Group an array by a key