Prior to structuredClone(), developers used JSON.parse(JSON.stringify(obj)) which broke Dates, Sets, Maps, and undefined properties. structuredClone() performs true deep copies natively.
JavaScript Structured Clone
Deep clone complex objects including Dates, RegExps, and nested maps natively.
Key Takeaways: JavaScript Structured Clone
Mastering JavaScript Structured Clone helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
JavaScript Structured Clone Code Example
JavaScriptconst original = {
name: "Project Alpha",
date: new Date(),
tags: new Set(["ai", "cloud"])
};
const copy = structuredClone(original);
copy.tags.add("devops");
console.log("Original tags count:", original.tags.size);
console.log("Copy tags count:", copy.tags.size);Output
Original tags count: 2 Copy tags count: 3
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