Benchmark: wuirefs81326wysdhsseyt

Tests:

array
String.prototype.replaceAt=function(index, char) { var a = this.split(""); a[index] = char; return a.join(""); }; 'abcde'.replaceAt(2,'a')
mine
const emptyArray = (index, item) => { var temp = new Array(index); temp[index] = item; return temp; }; String.prototype.replaceAt = function(index, char) { return Object.assign([...this], emptyArray(index, char)).join(``); }; 'abcde'.replaceAt(2,'a')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array
mine

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. A microbenchmark is a small program designed to measure the performance of specific parts of a programming language or a particular piece of code. In this case, we have two benchmark definitions:

1. **array**: This benchmark defines a simple function `String.prototype.replaceAt` that replaces a character at a specific index in a string.
2. **mine**: This benchmark defines a custom function `emptyArray` that creates an array with a specified length and returns it, which is then used to replace characters in a string.

**Options Compared**

The two benchmarks compare different approaches to replacing characters in a string:

1. **Original Implementation (array)**: The original implementation uses the `split()` method to split the string into an array, replaces the character at the specified index using the `a[index] = char` assignment, and then joins the array back together using the `join()` method.
2. **Custom Implementation (mine)**: The custom implementation creates an empty array with a specified length using the `emptyArray(index, item)` function and returns it. It then uses the `Object.assign()` method to merge this array with the original string, effectively replacing characters.

**Pros and Cons of Each Approach**

**Original Implementation (array)**:

Pros:

* Simple and easy to understand
* Uses built-in methods that are likely to be optimized by the browser

Cons:

* May be slower due to the overhead of creating an array and joining it back together
* May not take advantage of any available optimizations in the `join()` method

**Custom Implementation (mine)**:

Pros:

* Can potentially be faster since it avoids the overhead of joining an array
* Allows for more fine-grained control over the replacement process

Cons:

* More complex and harder to understand than the original implementation
* Requires creating a custom function, which may add overhead

**Library**

In both benchmark definitions, the `Object.assign()` method is used. `Object.assign()` is a built-in JavaScript method that merges one or more source objects into another object. In this case, it's used to merge an array with a string, effectively replacing characters.

**Special JS Features/Syntax**

There are no special JS features or syntax mentioned in the benchmark definitions.

**Other Alternatives**

If you wanted to improve upon the current implementation, here are some alternative approaches:

1. **Use `String.prototype.sub()`**: This method is similar to `String.prototype.replaceAt` but uses a more efficient algorithm.
2. **Use a custom array class**: Instead of using the built-in `Array` constructor, you could create a custom array class that provides optimized replacement functionality.
3. **Use SIMD instructions**: If you're targeting a platform with SIMD (Single Instruction, Multiple Data) support, you could use SIMD instructions to accelerate the replacement process.

Keep in mind that these alternative approaches would require more significant changes to the implementation and might not be worth it for small microbenchmarks like this one.

Related benchmarks:

wuirefs81326wysdhsseyt (version: 0)

Comparing performance of: array vs mine

Created: 6 years ago by: Guest

Jump to the latest result

array

mine

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):