Let's break down the benchmark and its test cases.

Benchmark Overview

The benchmark is designed to compare the performance of two approaches: using the spread operator (...) and Object.assign to create a new object by copying data from an existing object, specifically a single object with a sample property. The goal is to determine which approach is faster for non-destructive copying of a single object.

Options Compared

Two options are being compared:

1. Using the spread operator (...): This method creates a new object by spreading the properties of the original object into the new object.
2. Object.assign: This method creates a new object by copying the specified properties from an existing object.

Pros and Cons

• Using the spread operator (...):
  • Pros: Easy to read, concise syntax, works with modern JavaScript versions.
  • Cons: May have performance overhead due to the need to create a new object and iterate over its properties.
• Object.assign:
  • Pros: Fast, widely supported across browsers and Node.js versions.
  • Cons: Can be less readable, especially for those not familiar with the method.

Library Used

In this benchmark, none of the test cases use any external libraries. However, it's worth noting that Object.assign is a built-in JavaScript method, so no additional library is required.

Special JS Features/Syntax

The spread operator (...) was introduced in ECMAScript 2018 (ES2018) and became part of the standard in ES2020. It's a modern feature that allows for concise object creation and manipulation.

Benchmark Preparation Code

Since there is no Script Preparation Code provided, we'll assume it's not necessary to set up any specific environment or variables before running the benchmark. The focus is solely on comparing the performance of the two approaches.

Alternatives

If you need to compare other methods for creating a new object by copying data from an existing object, some alternatives include:

• Object.create(): Creates a new object with the specified prototype.
• Array.prototype.slice() or Array.prototype.concat(): Can be used to create a shallow copy of an array or object.
• **`JSON.parse(JSON.stringify(object))```: Can be used to create a deep copy of an object.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the spread operator and Object.assign.