For the longest time, you had to resort to workarounds and libraries to create a deep copy of a JavaScript value. The Platform now ships with structuredClone(), a built-in function for deep-copying.

Google’s web.dev is a resource for web developers, offering guidance, tips, and best practices for building websites and web applications. The site covers a range of topics including performance, accessibility, security, and development tools, all aimed at helping developers create user experiences. With a focus on the latest web technologies and standards, web.dev provides tutorials, coding labs, and articles authored by industry experts, making it a destination for developers looking to stay current in the evolving web landscape.

web.dev

The Platform now ships with structuredClone() , a built-in function for deep-copying. Changes to deeply nested values will be visible in the copy as well as the original. A deep copy copies an object’s properties one by one, but invokes itself recursively when it finds a reference to another object.

Deep-copying in JavaScript using structuredClone