Let's break down the provided benchmark and explain what's being tested.

Benchmark Definition

The benchmark is comparing three different approaches to create a copy of an object in JavaScript:

1. window.structuredClone(voucher)
2. { ...voucher } (Spread syntax)
3. Object.assign(copy, voucher) (Object assign)

Library and Purpose

structuredClone is a new JavaScript method introduced in ECMAScript 2020, which allows creating a shallow clone of an object. It's designed to be more efficient and flexible than traditional methods like Object.assign() or the spread syntax.

Options Compared

The benchmark compares three options:

1. window.structuredClone(voucher): This method creates a shallow clone of the voucher object using the new structuredClone function.
2. { ...voucher } (Spread syntax): This approach uses the spread operator (...) to create a shallow copy of the voucher object.
3. Object.assign(copy, voucher) (Object assign): This method creates a shallow clone of the voucher object by assigning its properties to a new object using Object.assign().

Pros and Cons

Here's a brief summary of each approach:

1. window.structuredClone(voucher)
   • Pros:
     • Designed for efficiency and flexibility
     • Handles circular references more effectively than traditional methods
   • Cons:
     • Not yet widely supported in older browsers (pre-ECMAScript 2020)
2. { ...voucher } (Spread syntax)
   • Pros:
     • Simple and concise syntax
     • Works in most modern browsers
   • Cons:
     • May not handle circular references well
     • Can be slower than structuredClone for large objects
3. Object.assign(copy, voucher) (Object assign)
   • Pros:
     • Widely supported in older browsers
     • Easy to understand and use
   • Cons:
     • May not handle circular references well
     • Can be slower than structuredClone for large objects

Other Considerations

When choosing an approach, consider the specific requirements of your project:

• Performance: If you need optimal performance, structuredClone might be a better choice.
• Browser Support: If you need to support older browsers, use the spread syntax or Object.assign().
• Circular References: If you work with objects that contain circular references, structuredClone is likely a better option.

Alternatives

Other alternatives for creating object copies include:

1. JSON.parse(JSON.stringify(voucher)): This method creates a shallow clone of an object using JSON parsing and stringification.
2. Array.prototype.slice.call(Object.assign({}, voucher)): This approach uses Object.assign() to create a new object, then converts it to an array using slice.call().
3. lodash.cloneDeep(): This is a popular utility library that provides a flexible and efficient way to clone objects.

Keep in mind that these alternatives may have different trade-offs and performance characteristics compared to the approaches tested in this benchmark.