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

Benchmark Purpose

The benchmark measures the performance of two approaches to create an array from the child nodes of an HTML element: using the spread operator (...) and Array.from() method.

Options Compared

The options compared are:

1. Spread Operator (ES6+): This approach uses the spread operator to create a new array by spreading the child nodes of the element.
2. Array.from() Method: This approach uses the built-in Array.from() method to create a new array from an iterable, such as the child nodes of the element.

Pros and Cons

• Spread Operator (ES6+):
  • Pros: Concise and expressive syntax, can be used in modern browsers.
  • Cons: Might not be supported in older browsers, can lead to slower performance due to the overhead of creating a new array.
• Array.from() Method:
  • Pros: Widespread support across browsers, including older ones. Can be optimized for better performance by passing an empty array and mapping over the child nodes.
  • Cons: Requires a more verbose syntax, might lead to slower performance due to the overhead of creating a new array.

Library/Technologies Used

None in this benchmark, as it only uses standard JavaScript features.

Special JS Features/Syntax (none)

There are no special JavaScript features or syntaxes used in this benchmark.

Other Alternatives

If you want to create an array from the child nodes of an HTML element without using these two approaches:

• For loop: You can use a traditional for loop to iterate over the child nodes and push them into an array.
• Array.from() with Object.values(): If the element has only one property (in this case, childNodes), you can use Object.values() to get an array of its values.

Benchmark Preparation Code

The preparation code is already provided in the benchmark definition JSON:

const div = document.getElementById("my-div");
for (let i = 0; i < 10000; i++) {
    const child = document.createElement("div");
    child.append(`I'm div-${i}`);
    div.append(child);
}

This code creates an HTML element with 10,000 child nodes and appends them to the my-div element.

Benchmark Results

The latest benchmark results are:

[
  {
    "RawUAString": "Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0",
    "Browser": "Firefox 120",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Linux",
    "ExecutionsPerSecond": 2066.62890625,
    "TestName": "Spread"
  },
  {
    "RawUAString": "Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0",
    "Browser": "Firefox 120",
    "DevicePlatform": "Desktop",
    "OperatingSystem": "Linux",
    "ExecutionsPerSecond": 2049.33056640625,
    "TestName": "Array.from"
  }
]

These results show the execution time per second for both test cases on a Firefox 120 browser on a Linux desktop, with an average of approximately 2066.63 executions per second for Spread and 2049.33 executions per second for Array.from.