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

Benchmark Definition

The benchmark definition is empty, which means that the script preparation code and HTML preparation code are not provided. This allows users to write their own script and HTML to test specific scenarios.

Individual Test Cases

There are three individual test cases:

1. Filter
   • Benchmark Definition: var test = [...]; var enabled = test.filter(t => t.enabled).length;
   • Purpose: To measure the performance of the filter() method.
   • Pros:
     • Easy to implement and understand.
     • Allows for a simple and concise benchmarking scenario.
   • Cons:
     • May not accurately represent real-world scenarios where data is large or complex.
2. forEach
   • Benchmark Definition: var test = [...]; var enabled = 0; test.forEach(t => { if(t.enabled) { ++enabled; } });
   • Purpose: To measure the performance of the forEach() method.
   • Pros:
     • Allows for a more comprehensive benchmarking scenario, including iteration and conditional statements.
   • Cons:
     • Can be less readable and maintainable due to the use of an increment variable.
3. for
   • Benchmark Definition: var test = [...]; var enabled = 0; for (var i = 0; i < test.length; ++i) { if (test[i].enabled) { ++enabled; } };
   • Purpose: To measure the performance of a traditional for loop.
   • Pros:
     • Similar to the forEach() method, but with a more explicit iteration syntax.
   • Cons:
     • Less readable and maintainable compared to the forEach() method.

Libraries

In this benchmark, no libraries are explicitly mentioned. However, it is likely that modern browsers like Chrome use various internal libraries or APIs under the hood. These might include:

• V8 (Chrome's JavaScript engine) itself
• Web Workers (for concurrent execution)
• Native methods for array operations (e.g., filter(), forEach())

Special JS Features

None of these test cases specifically target any special JavaScript features, such as:

• Arrow functions (=>)
• Async/await syntax (async function(...) { ... })
• Promises
• Generator functions

However, the use of traditional for loops and increment variables might have implications for developers who are accustomed to using modern JavaScript features.

Other Alternatives

For those interested in exploring alternative benchmarking approaches or libraries, here are a few suggestions:

• Benchmark.js: A lightweight, modular benchmarking library that supports various test cases and output formats.
• BenchPress.js: Another popular benchmarking library for Node.js applications.
• JsPerf: An online benchmarking tool specifically designed for JavaScript performance comparisons.

These alternatives can provide more comprehensive or specialized benchmarking capabilities, depending on the specific use case.