Benchmark: Map Reverse Vs Push

Script Preparation code:

var strs = Array.from(new Array(10000)).map(() => 'String concat. ')
var result = []

Tests:

Push
for (let i = 0; i < strs.length; i++) { result.push(strs[i]) }
Map with reverse
result = strs.reverse().map((a) => a)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
Map with reverse

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases to understand what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches for reversing and concatenating strings in JavaScript:

1. **Push**: Using the `push()` method to add elements to an array.
2. **Map with reverse**: Using the `reverse()` method to reverse the order of an array, followed by mapping over it.

**Options Compared**

The benchmark is testing these two approaches:

* Approach 1: Using `push()` to concatenate strings in a loop.
* Approach 2: Using `map()` and `reverse()` methods to concatenate strings in a loop.

**Pros and Cons**

Here's a brief overview of the pros and cons of each approach:

**Push**

Pros:

* Simple and straightforward implementation
* May be faster for small arrays or specific use cases

Cons:

* Inefficient for large arrays, as it involves frequent push operations
* May lead to garbage collection pauses if the array grows too large

**Map with reverse**

Pros:

* More efficient for large arrays, as it avoids frequent push operations and uses optimized algorithms
* Can handle array operations more elegantly

Cons:

* May require additional overhead due to the `reverse()` method
* Requires explicit handling of edge cases (e.g., empty or null arrays)

**Other Considerations**

In this benchmark, we can also observe that the test case uses a library: the `Array.from()` method, which is a modern JavaScript API for creating arrays from iterables.

Additionally, there's no special JS feature or syntax being tested in these test cases. Both approaches are standard JavaScript constructs.

**Alternative Approaches**

If you're looking for alternative approaches to concatenate strings in JavaScript, here are a few examples:

* Using the `join()` method: `strs.join('')`
* Using template literals: `'${strs[0]} ${strs[1]} ...'`
* Using a custom concatenation function: `concatStrings(strs) { return strs.map(s => s).join(''); }`

Keep in mind that these alternatives might not be as efficient or readable as the original push and map-with-reverse approaches.

I hope this explanation helps!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Push	590.6 Ops/sec
Map with reverse	18725.8 Ops/sec

Related benchmarks:

Map Reverse Vs Push (version: 1)

Comparing performance of: Push vs Map with reverse

Created: one year ago by: Registered User

Jump to the latest result

Push

Map with reverse

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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