Let's break down what's being tested in this benchmark.

Benchmark Definition

The benchmark is comparing three approaches for concatenating arrays:

1. Array.prototype.concat()
2. The new ES6 spread operator ([ ...params, 1])
3. Using the push() method to add an element to the end of the array (other.push(1))

Options Compared

The benchmark is comparing two main options:

• Array.prototype.concat(): a traditional way of concatenating arrays using the concat() method.
• The new ES6 spread operator ([ ...params, 1]): a concise and modern way of creating a new array by spreading elements from an existing array.

Pros and Cons

Here are some pros and cons of each approach:

• Array.prototype.concat():
  • Pros: widely supported, easy to understand.
  • Cons: can be slower than the spread operator for large arrays, may involve unnecessary copying.
• New ES6 spread operator ([ ...params, 1]):
  • Pros: faster and more memory-efficient than concat(), concise syntax.
  • Cons: requires modern JavaScript engines (ES6+) to support it.

Library

None of the benchmarked methods use a third-party library. The focus is on comparing the performance of these built-in JavaScript features.

Special JS Feature or Syntax

The ES6 spread operator ([ ...params, 1]) is a new feature introduced in ECMAScript 2015 (ES6). It's not widely supported in older browsers or JavaScript engines.

Other Alternatives

If you're interested in exploring other approaches to concatenating arrays, some alternatives include:

• Using the Array.prototype.push() method with two arguments (other.push(1)): this is similar to using concat(), but can be slightly faster.
• Creating a new array using the Array.from() method: new Array(3).fill().map(() => ({ value: params[0] }, 1, true)).flat(1, Infinity).push(1)

Keep in mind that these alternatives may have different performance characteristics and are not as concise as the spread operator.

Overall, this benchmark provides a simple and controlled comparison of three common approaches to concatenating arrays in JavaScript.