Benchmark: replaceAll vs regex replace 2

Script Preparation code:

String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.replace(new RegExp(search, 'g'), replacement);
};

Tests:

replace regex
"this is it adfasdfasdfasdfa kjlkjl kk jk j jk jlkjkljkljkljkjlkjlkjlkjkljk jjljkljlkjl".replace(/ /g, '+');
replace All
"this is it adfasdfasdfasdfa kjlkjl kk jk j jk jlkjkljkljkljkjlkjlkjlkjkljk jjljkljlkjl".replaceAll(' ', '+');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
replace All

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript benchmark that compares two different approaches to replace strings: using regular expressions (`/ /g`) and custom `replaceAll` method.

The custom `replaceAll` method is defined in the script preparation code:
```javascript
String.prototype.replaceAll = function(search, replacement) {
  var target = this;
  return target.replace(new RegExp(search, 'g'), replacement);
}
```
This method is used to replace all occurrences of a substring (`search`) with another string (`replacement`) in the original string (`target`).

**Options Compared**

There are two options compared:

1. **Regular Expressions (`/ /g`)**: This approach uses regular expressions to replace strings. The `/ /g` syntax matches one or more whitespace characters (`\s`) globally (`g`) across the entire string.
2. **Custom `replaceAll` method**: This approach uses a custom method to replace all occurrences of a substring with another string.

**Pros and Cons**

1. **Regular Expressions (`/ /g`)**:
	* Pros: Widely supported by JavaScript engines, efficient for simple replacements.
	* Cons: Can be slow for large strings or complex patterns, may not work as expected in certain edge cases (e.g., non-ASCII characters).
2. **Custom `replaceAll` method**:
	* Pros: May be faster than regular expressions for specific use cases, can provide better performance for small to medium-sized strings.
	* Cons: Limited support by JavaScript engines, may not be as efficient as native regex implementations.

**Library/Functionality**

The custom `replaceAll` method uses the built-in `replace()` method from JavaScript's String prototype. This method is implemented in V8 (Google Chrome's JavaScript engine) and can be used to replace all occurrences of a substring with another string.

**Special JS Features/Syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is typically required for basic string manipulation.

**Other Alternatives**

If you want to try alternative approaches, consider the following:

1. **Using `String.prototype.replace()` method**: This approach is similar to the custom `replaceAll` method but uses a more traditional syntax.
2. **Using a third-party library or extension function**: Some JavaScript libraries (e.g., Lodash) provide optimized string replacement functions that may outperform native implementations.

Keep in mind that the performance differences between these approaches can vary depending on the specific use case, input data, and JavaScript engine used.

Related benchmarks:

replaceAll vs regex replace 2 (version: 0)

Comparing performance of: replace regex vs replace All

Created: 5 years ago by: Guest

Jump to the latest result

replace regex

replace All

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):