Benchmark: rev test2 - MeasureThat.net

Script Preparation code:

var arr = Array.from({length: 10000}).map((_, i) => ({i}));

Tests:

reduce
var arr2 = arr.reduce((acc, o) => [{...o}, ...acc], []);
reverse
var arr2 = arr.map(o => ({...o})).reverse();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce
reverse

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Let's break down the provided JSON data and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JavaScript code snippet that defines two test cases: `reduce` and `reverse`. The code creates an array `arr` with 10,000 elements using `Array.from()` and maps each element to a new object. Then, it tests two different approaches:

1. **Reduce**: It applies the `reduce()` method to the mapped array, accumulating an initial value (`[]`) into an array.
2. **Reverse**: It uses the `map()` function to create a new array with the mapped elements, reverses this array using the `reverse()` function.

**Library and Purpose**

In both test cases, no specific library is used. However, the `Array.from()` method is a standard JavaScript method introduced in ECMAScript 2015 (ES6) that creates an array from an iterable source.

**Special JS Features/Syntax**

None of the provided benchmark definitions use special JavaScript features or syntax beyond ES6 methods like `Array.from()`, `map()`, and `reduce()`. The tests are focused on comparing the performance of these two specific methods in different browsers.

**Options Compared**

The comparison is between two approaches:

1. **Reduce**: Accumulates elements into an array using `reduce()`.
2. **Reverse**: Reverses a new array created by mapping elements using `reverse()`.

**Pros and Cons**

Here are the pros and cons of each approach:

* **Reduce**:
	+ Pros: Efficient for accumulating values, can handle large datasets.
	+ Cons: May be slower due to the overhead of the accumulator function.
* **Reverse**:
	+ Pros: Can be faster since it only reverses a new array, without accumulation.
	+ Cons: May be slower than `reduce()` when dealing with very large datasets.

**Other Alternatives**

If you wanted to compare these methods in different scenarios, here are some alternative test cases:

* Using `forEach()`: This method iterates over the elements of an array and executes a provided function for each element. You could compare its performance with `reduce()` or `reverse()`.
* Using `array.prototype.slice()`: This method creates a shallow copy of an array segment. You could compare its performance with `map()` or `reduce()`.
* With large datasets, you could also test the performance of different data structures, such as arrays vs. linked lists.

Keep in mind that benchmarking JavaScript performance is complex and can be influenced by many factors, including browser optimizations, hardware, and other system resources.

Related benchmarks:

rev test2 (version: 1)

Comparing performance of: reduce vs reverse

Created: 3 years ago by: Registered User

Jump to the latest result

reduce

reverse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):