Benchmark: replaceAll vs regex replace string

Tests:

replace regex
"replace all spaces a b c d e f g h i j k l m n o p q r s t u v w x y z".replace(/ /g, "+");
replace All
"replace all spaces a b c d e f g h i j k l m n o p q r s t u v w x y z".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

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition:**

The benchmark measures the performance of two approaches to replace all occurrences of spaces with commas in a string:

1. **Regular Expressions (Regex)**: The first approach uses the `.replace()` method with a regular expression pattern (`/ /g`) to match all spaces and replace them with commas.
2. **String Method `replaceAll`**: The second approach uses the `replaceAll()` method, which is a part of the JavaScript String prototype.

**Options Compared:**

The benchmark compares the performance of these two approaches:

* **Regular Expressions (Regex)**:
	+ Pros:
		- Can match complex patterns and replace multiple occurrences.
		- Flexible and powerful for text processing.
	+ Cons:
		- Can be slower due to the overhead of creating a regular expression pattern.
		- May have performance issues with very large strings or complex patterns.
* **String Method `replaceAll`**:
	+ Pros:
		- Typically faster than using regex due to its optimized implementation.
		- Simplistic and easy to use for simple string replacement tasks.

**Pros and Cons of Different Approaches:**

For this specific benchmark, the regular expressions approach may be slower due to the overhead of creating a pattern. However, if you need to perform complex text processing or match specific patterns, regex can be a powerful tool. On the other hand, the `replaceAll()` method is likely to be faster and more suitable for simple string replacement tasks.

**Library and Purpose:**

None of the test cases use any external libraries. The `replace()` and `replaceAll()` methods are built-in JavaScript functions that operate directly on strings.

**Special JS Feature or Syntax:**

There is no mention of any special JavaScript features or syntax in this benchmark. The code only uses standard JavaScript syntax for string replacement.

**Other Alternatives:**

For similar string replacement tasks, other approaches you could consider include:

1. **Using a library like jQuery**: While not necessary for this simple task, jQuery's `.replace()` method can be more convenient and flexible than the built-in `replace()` method.
2. **Using a third-party regex engine**: If you need to perform complex text processing or require more advanced features, you could consider using a dedicated regex engine like RegEx.js.

In summary, this benchmark compares two approaches to replace all spaces with commas in a string: regular expressions (regex) and the `replaceAll()` method. While both have their pros and cons, the `replaceAll()` method is likely to be faster and more suitable for simple string replacement tasks.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36 Edg/119.0.0.0

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
replace regex	1185026.5 Ops/sec
replace All	1176237.2 Ops/sec

Related benchmarks:

replaceAll vs regex replace string (version: 0)

Comparing performance of: replace regex vs replace All

Created: one year ago by: Guest

Jump to the latest result

replace regex

replace All

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):