Benchmark: regexReplace vs arrayReplace

Script Preparation code:

var demoStr = 'This is a  demo of a  long string with  multiple spaces occasionally  added throughout  it.';

function regexReplace(str) {
  return str.replace(/\s+/g, ' ');
};

function arrayReplace(str) {
  let resultArr = [];
  const strArr = str.split(' ');
  for (let i = 0; i < strArr.length; i++) {
    if (strArr[i] != '') {
      resultArr.push(strArr[i]);
    }
  }
  return resultArr.join(' ');
};

Tests:

regexReplace
regexReplace(demoStr);
arrayReplace
arrayReplace(demoStr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regexReplace
arrayReplace

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided JSON represents a JavaScript microbenchmarking test case for comparing the performance of two different approaches to replace multiple whitespace characters in a string: `regexReplace` and `arrayReplace`.

In this benchmark, we have two functions:

1. `regexReplace(str)`: This function uses the built-in `String.prototype.replace()` method with a regular expression (`/\\s+/g`) to replace all occurrences of one or more whitespace characters (`\\s+`) with a single space character.
2. `arrayReplace(str)`: This function iterates through each character in the input string using `str.split(' ')`, and then uses an array to store only non-empty strings, finally joining them back together with spaces.

**Options Compared**

The benchmark compares the performance of these two approaches:

1. **regexReplace**: Uses regular expressions to replace multiple whitespace characters.
2. **arrayReplace**: Iterates through each character in the string using `str.split(' ')` and filters out non-empty strings.

**Pros and Cons of Each Approach**

1. **regexReplace**:
	* Pros:
		+ Efficient and concise code.
		+ Can be easily extended to match other whitespace patterns.
	* Cons:
		+ May have performance overhead due to the complexity of regular expressions.
		+ May not perform well for very large input strings or complex patterns.
2. **arrayReplace**:
	* Pros:
		+ Simple and easy to understand code.
		+ Can be suitable for large input strings or complex whitespace patterns.
	* Cons:
		+ More verbose code compared to `regexReplace`.
		+ May have performance overhead due to the iteration and filtering process.

**Library Used**

There is no explicit library mentioned in the provided JSON. However, it's worth noting that both approaches use standard JavaScript functions and methods.

**Special JS Features/Syntax**

No special JavaScript features or syntax are used in this benchmark. It only relies on standard JavaScript programming constructs.

**Other Alternatives**

If you need to replace multiple whitespace characters in a string, other alternatives might include:

1. Using `String.prototype.replaceAll()` (not supported in older browsers).
2. Using a library like `regex- escape` or `js-regexpr` for more complex regular expression patterns.
3. Using a string processing library like `lodash` or `underscore` which provides optimized implementations of various string methods.

Keep in mind that the choice of approach ultimately depends on the specific requirements and constraints of your project, such as performance, conciseness, and maintainability.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser/OS: Chrome 60 on Mac OS X 10.12.6

View result in a separate tab

Test name	Executions per second
regexReplace	863556.1 Ops/sec
arrayReplace	1209819.5 Ops/sec

Related benchmarks:

regexReplace vs arrayReplace (version: 0)

Comparing performance of: regexReplace vs arrayReplace

Created: 7 years ago by: Guest

Jump to the latest result

regexReplace

arrayReplace

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):