Let's dive into the world of JavaScript microbenchmarks!

Benchmark Overview

The provided benchmark compares three ways to concatenate arrays in JavaScript: concat(), spread operator (...), and push().

Options Compared

1. concat(): The traditional way to concatenate arrays using the concat() method.
2. Spread Operator (...): A new feature introduced in ECMAScript 2015 that allows creating a new array by spreading elements from an existing array.
3. push() with spread operator (...): Combining the push() method with the spread operator to concatenate arrays.

Pros and Cons

1. concat():
   • Pros: Well-established, widely supported, and easy to understand.
   • Cons: Can be slow for large arrays due to its overhead.
2. Spread Operator (...):
   • Pros: Fast, efficient, and concise.
   • Cons: Not as well-known or widely supported as concat().
3. push() with spread operator (...):
   • Pros: A balance between speed and readability, as it avoids the overhead of concat().
   • Cons: Can be slower than the spread operator alone due to the additional function call.

Library Use

None of the test cases use external libraries.

Special JavaScript Features or Syntax

The tests do not include any special JavaScript features or syntax that would affect their execution. However, it's worth noting that the spread operator (...) is a feature introduced in ECMAScript 2015 and might not be supported by older browsers or versions of JavaScript.

Benchmark Preparation Code

There is no preparation code provided for each test case.

Latest Benchmark Results

The latest results show:

1. push(): The fastest execution per second (15,1940.125), indicating that it is the most efficient method among the three options.
2. Spread Operator (...): The second-fastest, with an execution rate of 155,1940.125 seconds.
3. concat(): The slowest option, with an execution rate of 200,2007.25 seconds.

Other Alternatives

If you need to concatenate arrays in JavaScript, other alternatives could be:

• Using Array.prototype.push.apply(): Similar to the spread operator, but with a function call instead of syntax.
• Utilizing Array.prototype.concat() with an array literal: Creating a new array and concatenating elements using an array literal.
• Employing a loop-based approach: Iterating over the elements to be concatenated and adding them to the resulting array.

Keep in mind that these alternatives might have different performance characteristics compared to the options tested in this benchmark.