Benchmark: spacify - 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);
}

function regexS(str) {
  return str.replace(/(.)(?!$)/g, '$1 ');
}

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
loop A
loop B
reduce
regex

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 Analysis**

MeasureThat.net provides a platform for creating and running JavaScript microbenchmarks. The provided benchmark definition json represents a simple string manipulation function `splitJoin`, which is split into two separate functions: `loopA` and `loopB`. Another function, `reduceS`, and a regular expression-based function `regexS` are also included.

**Options Compared**

The benchmark compares the performance of four different approaches:

1.  **Array.prototype.join()**: This method uses the array's built-in join functionality to concatenate elements with a separator.
2.  **Manual looping (`loopA`)**: This approach manually iterates through each character in the string and concatenates it with a space.
3.  **Array.prototype.reduce()**: This method uses the array's built-in reduce functionality to concatenate elements with a separator.
4.  **Regular expression-based solution (`regexS`)**: This approach uses a regular expression to replace each non-space character with itself followed by a space.

**Pros and Cons of Each Approach**

1.  **Array.prototype.join()**:
    *   Pros:
        *   Efficient and concise
        *   Uses built-in functionality, reducing overhead
    *   Cons:
        *   May not perform well for very large strings due to string concatenation limitations in JavaScript engines
2.  **Manual looping (`loopA`)**:
    *   Pros:
        *   Simple and easy to understand
        *   No external dependencies or built-in function calls
    *   Cons:
        *   Inefficient due to the overhead of string concatenation and potential for incorrect results if not implemented carefully
3.  **Array.prototype.reduce()**:
    *   Pros:
        *   Efficient and concise
        *   Uses built-in functionality, reducing overhead
4.  **Regular expression-based solution (`regexS`)**:
    *   Pros:
        *   Easy to understand and implement
        *   Can be more flexible than other approaches for certain use cases
    *   Cons:
        *   May be slower than other approaches due to the overhead of regular expressions

**Library Used**

None of the provided functions directly use a library. However, `Array.prototype.join()` uses an internal implementation that might depend on specific libraries or frameworks.

**Special JS Features/Syntax**

No special JavaScript features or syntax are used in this benchmark.

**Alternative Approaches**

Other approaches to achieve similar results could include:

*   Using a template literal (e.g., `splitJoin('hello world')` instead of string concatenation)
*   Utilizing the `concat()` method with an array
*   Leveraging a third-party library like Lodash for utility functions

Keep in mind that the most efficient approach may depend on the specific use case and requirements.

**Benchmark Result Analysis**

The latest benchmark results show that:

*   The `loopB` function performs significantly better than other approaches, indicating its efficiency.
*   The `regexS` function is slower due to the overhead of regular expressions.
*   The `reduceS` function falls in between, with performance closer to `loopA`.
*   The `splitJoin` function uses an internal implementation that provides a good balance between readability and performance.

These results are specific to the provided benchmark and might not be representative of all use cases.

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 8.0.0; Pixel Build/OPR3.170623.007) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.116 Mobile Safari/537.36

Browser/OS: Chrome Mobile 60 on Android 8.0.0

View result in a separate tab

Test name	Executions per second
split	462609.2 Ops/sec
loop A	792329.3 Ops/sec
loop B	525808.1 Ops/sec
reduce	237432.6 Ops/sec
regex	263558.4 Ops/sec

Related benchmarks:

spacify (version: 7)

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

Created: 7 years ago by: Registered User

Jump to the latest result

split

loop A

loop B

reduce

regex

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):