3 snippets in JavaScript
structuredClone(value)const original = [
{ name: "Ava", scores: [90, 85] },
{ name: "Leo", scores: [78, 92] },
];
const clone = structuredClone(original);
clone[0].scores.push(100);
console.log(original[0].scores); // [90, 85] (not affected)
console.log(clone[0].scores); // [90, 85, 100]Note structuredClone handles nested objects, arrays, Maps, Sets, Dates, RegExps, and more. Does NOT clone functions, DOM nodes, or prototypes.
structuredClone(obj)const original = {
user: { name: "Kai", tags: ["admin", "editor"] },
updatedAt: new Date(),
};
const clone = structuredClone(original);
clone.user.tags.push("viewer");
console.log(original.user.tags); // ["admin", "editor"]Note Handles circular references, Dates, Maps, Sets, ArrayBuffers, and more. Does NOT clone functions, Errors, or DOM nodes.
const clone = structuredClone(value);const original = {
name: "Ava",
scores: [95, 88, 72],
metadata: { joined: new Date("2024-01-15") },
};
const clone = structuredClone(original);
clone.scores.push(100);
clone.metadata.joined.setFullYear(2025);
console.log(original.scores); // [95, 88, 72]
console.log(original.metadata.joined); // 2024-01-15 (unchanged)Note Built-in deep clone that handles Dates, Maps, Sets, RegExps, ArrayBuffers, circular references. Cannot clone functions, DOM nodes, or Error objects.