Let's break down what's being tested in this JavaScript microbenchmark.

Benchmark Definition

The benchmark is designed to compare three approaches for concatenating arrays:

1. Spread operator (...): const c = [...t1, ...t2];
2. concat() method: const c = t1.concat(t2);
3. push() method with spread operator (...): t1.push(...t2); const c= t1;

Options Compared

The benchmark is comparing the performance of these three approaches:

• Spread Operator: Using the spread operator to concatenate arrays. This approach is relatively new and has gained popularity in recent years due to its concise syntax.
• concat() Method: Using the concat() method, which is a built-in array method that concatenates two or more arrays.
• push() Method with Spread Operator: Using the push() method with the spread operator (...). This approach combines the benefits of both methods.

Pros and Cons

Here's a brief summary of each approach:

• Spread Operator:
  • Pros: Concise syntax, easy to read and write, efficient.
  • Cons: May not be as well-supported in older browsers or versions of JavaScript.
• concat() Method:
  • Pros: Well-established and widely supported, reliable performance.
  • Cons: Can be less readable than the spread operator due to its method call syntax.
• push() Method with Spread Operator:
  • Pros: Combines benefits of both methods (convenience and efficiency).
  • Cons: May have slightly higher overhead due to the push() method call.

Library Usage

None of the test cases use any external libraries.

Special JS Features or Syntax

The benchmark uses a few modern JavaScript features:

• Spread operator (...): This feature was introduced in ECMAScript 2015 (ES6) and allows for concise syntax when concatenating arrays.
• Template literals (\r\n): While not exclusive to JavaScript, template literals are used in the script preparation code to create a multi-line string.

Other Alternatives

If you're looking for alternative approaches to concatenate arrays, you could consider:

• Using Array.prototype.push.apply() method: This method applies the spread operator's behavior to an array by passing it as an argument.
• Using Array.prototype.reduce() method: This method can be used to concatenate arrays in a more functional programming style.

Keep in mind that these alternatives may have slightly different performance characteristics and readability implications compared to the approaches tested in this benchmark.