Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

Benchmark Definition

The provided JSON represents a benchmark definition for comparing two approaches to reducing an array: using concat() with push versus the new ES6 spread operator (...). The benchmark aims to measure which approach is faster and more efficient.

Options Compared

Two options are being compared:

1. Traditional concat() method and push: This approach uses the Array.prototype.concat() method, which creates a new array by copying elements from an existing array, followed by assigning each element of the original array using the push() method.
2. New ES6 spread operator (...): This approach uses the spread operator to create a new object with key-value pairs from the original array.

Pros and Cons

• Traditional concat() method and push:
  • Pros: Widely supported, easy to understand, and has been used for a long time.
  • Cons: Can be slow due to the overhead of creating a new array and iterating over the elements.
• New ES6 spread operator (...):
  • Pros: Faster, more efficient, and concise. It's also widely supported in modern browsers and Node.js versions.
  • Cons: May require a good understanding of the syntax, and its performance can vary depending on the browser or environment.

Library Used

In this benchmark, no specific library is used. The focus is solely on comparing two JavaScript built-in methods.

Special JS Feature/Syntax

The ES6 spread operator (...) is being tested. This feature was introduced in ECMAScript 2015 and allows for concise object creation from arrays or other iterables.

Other Alternatives

Before settling on these two approaches, developers might consider alternative methods:

• Using Array.prototype.reduce() without the spread operator to create a new array.
• Utilizing Array.prototype.map() followed by Object.fromEntries() to transform the array into an object.
• Leveraging libraries like Lodash or Underscore.js for array manipulation.

Benchmark Preparation Code

The provided JSON does not include any script preparation code, suggesting that the benchmark is focused on measuring the performance difference between these two approaches in a vanilla JavaScript environment.