Benchmark: spacify test - MeasureThat.net

Script Preparation code:

function splitJoin(str) {
  return str.split('').join(' ');
}

function loopA(str) {
  let acc = '';
  for(let i = 0, l = str.length; i < l; i++) {
    acc += i ? ' ' + str[i] : str[i];
  }
  return acc;
}

function loopB(str) {
  let acc = '';
  for(let i = 0, l = str.length; i < l; i++) {
    acc += str[i] + ' ';
  }
  return acc.slice(0, acc.length - 1);
}

function reduceS(str) {
  return Array.prototype.reduce.call(str, (acc, n) => acc + ' ' + n);
}

Tests:

split
splitJoin('hello world')
loop A
loopA('hello world')
loop B
loopB('hello world')
reduce
reduceS('hello world')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
loop A
loop B
reduce

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing the performance of different approaches for various scenarios.

**Benchmark Definition JSON Explanation**

The provided benchmark definition JSON contains two main components:

1. **Script Preparation Code**: This section defines three JavaScript functions:
	* `splitJoin(str)`: splits the input string `str` into an array of individual characters and joins them back together with spaces.
	* `loopA(str)`: initializes an accumulator variable `acc` and iterates through each character in the input string `str`, appending it to `acc` with a space if it's not the first character.
	* `loopB(str)`: similar to `loopA`, but appends the character to `acc` followed by a space instead of just adding a space.
	* `reduceS(str)`: uses the `Array.prototype.reduce()` method to concatenate all characters in the input string `str` with spaces, excluding the last one.
2. **Html Preparation Code**: This section is empty, indicating that no HTML-specific code needs to be executed before running the benchmark.

**Individual Test Cases**

The provided test cases define four individual benchmarks:

1. **"split"`**: tests the performance of splitting a string into an array of characters.
2. **"loop A"`: tests the performance of the `loopA` function.
3. **"loop B"`: tests the performance of the `loopB` function.
4. **"reduce"`: tests the performance of the `reduceS` function.

**Comparison Options**

The benchmark compares the following options:

1. **Split Join**: uses the `splitJoin` function to split and join a string.
2. **Loop A**: uses the `loopA` function to concatenate characters with spaces.
3. **Loop B**: uses the `loopB` function to concatenate characters with spaces.
4. **Reduce**: uses the `reduceS` function to concatenate characters with spaces.

**Pros and Cons of Each Approach**

1. **Split Join**:
	* Pros: straightforward and efficient, especially for small strings.
	* Cons: may be slower than other approaches for larger strings due to the overhead of creating an array.
2. **Loop A**:
	* Pros: simple and easy to understand, can be optimized using techniques like caching or memoization.
	* Cons: potentially slower than `splitJoin` or `loopB` due to the overhead of appending characters to a string.
3. **Loop B**:
	* Pros: similar performance to `loopA`, but with an additional space appended at the end, which can affect cache efficiency.
4. **Reduce**:
	* Pros: efficient and optimized for large strings using the `Array.prototype.reduce()` method.
	* Cons: may require a good understanding of JavaScript's built-in methods and their optimizations.

**Library Usage**

The benchmark uses the following library:

1. **`Array.prototype.reduce()`**: a built-in JavaScript method used by the `reduceS` function to concatenate characters with spaces.

**Special JS Features/Syntax**

None mentioned in the provided explanation.

**Alternatives**

Other alternatives for these approaches might include:

1. **Split Join**: using a dedicated library like Lodash's `split` function or a custom implementation optimized for performance.
2. **Loop A** and **Loop B**: using a more efficient data structure, such as a `String` with `charCodeAt()` access instead of iterating through each character.
3. **Reduce**: exploring alternative methods like `Array.prototype.forEach()` or a custom implementation using a loop.

Keep in mind that the choice of approach depends on the specific use case, performance requirements, and personal preference.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser/OS: Chrome 60 on Mac OS X 10.12.5

View result in a separate tab

Test name	Executions per second
split	1076098.9 Ops/sec
loop A	842035.8 Ops/sec
loop B	682819.7 Ops/sec
reduce	406425.9 Ops/sec

Related benchmarks:

spacify test (version: 0)

Comparing performance of: split vs loop A vs loop B vs reduce

Created: 7 years ago by: Registered User

Jump to the latest result

split

loop A

loop B

reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):