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

Benchmark Overview

The provided JSON represents two test cases for a benchmark that compares the performance of two approaches to create an object from an array: using Array.prototype.reduce() and using a for loop with indexing. The goal is to determine which approach is faster.

Options Compared

Two options are compared:

1. reduce(): This method applies a user-supplied function to each element in the array, accumulating a value or object.
2. forcycle (for loop with indexing): A traditional for loop that iterates over the array, assigning each element to an object using its index as the key.

Pros and Cons of Each Approach

reduce():

Pros:

• More concise and expressive code
• Built-in support for iterating over arrays in a declarative way
• Can be used with various callback functions to manipulate data

Cons:

• May have higher overhead due to function invocation and object creation
• Limited control over iteration order (by default)

forcycle:

Pros:

• More explicit and predictable control over the iteration process
• Allows for manual assignment of elements to objects
• Can be optimized for specific use cases

Cons:

• More verbose code compared to reduce()
• May lead to boilerplate code repetition if not used carefully

Library and Special JS Feature

In this benchmark, no libraries are explicitly mentioned, but it's possible that the Array.prototype.reduce() method relies on internal implementations provided by the ECMAScript standard.

No special JavaScript features are used in these test cases.

Benchmark Preparation Code

The provided script preparation code creates an array of 10,000 objects with unique id and name properties:

var ppl = [];
for (var i = 0; i < 10000; i++) {
    ppl.push({ id: i, name: i + "" });
}

The HTML preparation code is not specified, as it's likely that the benchmark runs in a browser environment with an existing DOM.

Latest Benchmark Result

The latest result shows two test cases:

1. forcycle: With 327 executions per second on a Chrome 85 browser on a Windows desktop.
2. reduce(): With 36 executions per second on the same browser and hardware configuration.

These results suggest that, in this specific case, the forcycle approach is significantly faster than using Array.prototype.reduce().

Other Alternatives

If you're interested in exploring other approaches for creating an object from an array, consider these alternatives:

• Using Object.assign() or Array.prototype.map()
• Implementing a custom loop with manual indexing and assignment
• Utilizing library functions like lodash or ramda

Keep in mind that the best approach depends on your specific use case and performance requirements. MeasureThat.net's benchmark results can serve as a starting point for further optimization and exploration.