Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

Benchmark Purpose

The primary goal of this benchmark is to compare two approaches for adding an element to an array: Array.prototype.concat() and the new ES6 spread operator (...). The test aims to determine which method performs better, with a focus on speed and efficiency.

Options Compared

Two options are being compared:

1. Array.prototype.concat(): A traditional method of concatenating arrays using the concat() function.
2. Spread Operator (...): A new feature introduced in ES6 that allows for more concise array creation by spreading elements into a new array.

Pros and Cons

Here's a brief summary of each approach:

• Array.prototype.concat():
  • Pros: Widely supported, easy to use, and well-documented.
  • Cons: Can be slower than the spread operator, especially for large arrays.
• Spread Operator (...):
  • Pros: More concise, often faster, and more readable.
  • Cons: Not as widely supported (older browsers), may not work as expected in some cases.

Library and Purpose

In this benchmark, no specific library is used beyond the built-in JavaScript Array.prototype. The spread operator's purpose is to allow for a more efficient way of creating new arrays without using concat() or other explicit methods.

Special JS Feature/Syntax

The benchmark utilizes the ES6 spread operator (...), which was introduced in ECMAScript 2015. This feature allows for more concise array creation and modification, making it easier to work with arrays in JavaScript.

Other Alternatives

If you're interested in alternative approaches, here are a few options:

• Using Array.prototype.push(): Another way to add elements to an array, which might be faster than concat().
• Using Array.from(): A method that creates a new array from an iterable source, which could potentially offer better performance.
• Using a library like Lodash's _.compact(): A utility function that can help with array manipulation and concatenation.

Keep in mind that these alternatives might not be as efficient or readable as the spread operator, but they can provide different trade-offs depending on your specific use case.

I hope this explanation helps you understand what's being tested in this benchmark!