Benchmark: Native replaceAll vs regex replace vs replace with String.raw

Tests:

replace regex
"Hello, [%user_name%]! What's up, [%user_name%]?".replace(/\[\%user_name\%\]/g, 'Jane');
replace All
"Hello, [%user_name%]! What's up, [%user_name%]?".replaceAll(`[%user_name%]`, 'Jane');
replace regex with String.raw
"Hello, [%user_name%]! What's up, [%user_name%]?".replace(new RegExp(String.raw`\[\%user_name\%\]`, "g"), 'Jane');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
replace All
replace regex with String.raw

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and explain what's being tested, the different approaches, their pros and cons, and other considerations.

**Benchmark Definition**

The `Name` is "Native replaceAll vs regex replace vs replace with String.raw". This benchmark compares three different methods of replacing a placeholder in a string:

1. **Native `replaceAll()`**: Using the built-in JavaScript method `replaceAll()`.
2. **Regex Replace**: Using regular expressions to replace the placeholder.
3. **Replace with `String.raw`**: Using the `String.raw` syntax to create a template string.

**Individual Test Cases**

There are three test cases:

1. **"replace regex"**
```json
"Benchmark Definition": "\"Hello, [%user_name%]! What's up, [%user_name%]?\".replace(/\\[\\%user_name\\%\\]/g, 'Jane');",
```
This test case uses regular expressions to replace the `%user_name%` placeholder with `Jane`. The `/\\[\\%user_name\\%\\]/g` pattern matches any occurrence of `%user_name%` anywhere in the string, and replaces it with `Jane`.

2. **"replace All"**
```json
"Benchmark Definition": "\"Hello, [%user_name%]! What's up, [%user_name%]?\".replaceAll(`[%user_name%]`, 'Jane');",
```
This test case uses the `replaceAll()` method to replace the `%user_name%` placeholder with `Jane`. The `String.raw` syntax is used to create a template string.

3. **"replace regex with String.raw"**
```json
"Benchmark Definition": "\"Hello, [%user_name%]! What's up, [%user_name%]?\".replace(new RegExp(String.raw`\\[\\%user_name\\%\\]`, \"g\"), 'Jane');",
```
This test case uses regular expressions to replace the `%user_name%` placeholder with `Jane`. The `String.raw` syntax is used to create a template string, and the `RegExp` constructor is used to create a regex pattern.

**Pros and Cons**

1. **Native `replaceAll()`**:
	* Pros: Fast, efficient, and widely supported.
	* Cons: May not work as expected with complex patterns or edge cases.
2. **Regex Replace**:
	* Pros: Flexible, powerful, and can handle complex patterns.
	* Cons: Can be slow, especially for large strings or complex patterns.
3. **Replace with `String.raw`**:
	* Pros: Fast, efficient, and easy to use.
	* Cons: May not work as expected with complex patterns or edge cases.

**Library and Purpose**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that JavaScript template literals (e.g., `String.raw`) are a built-in feature of the language, and do not rely on external libraries.

**Special JS Feature/Syntax**

The `String.raw` syntax is used to create template strings, which allows for more efficient string creation and manipulation. This syntax was introduced in ECMAScript 2015 (ES6) as part of the Template Literals feature.

**Other Alternatives**

If you need to replace placeholders in a string, other alternatives include:

1. **Using a library like Moment.js**: For date formatting and manipulation.
2. **Using a templating engine like Handlebars**: For complex template rendering.
3. **Using a regex library like Regexr**: For advanced regex patterns.

However, for simple use cases, the native JavaScript methods (`replaceAll()` or template literals) are usually sufficient and efficient.

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 118 on Android

View result in a separate tab

Test name	Executions per second
replace regex	3738516.8 Ops/sec
replace All	3210140.0 Ops/sec
replace regex with String.raw	637968.9 Ops/sec

Related benchmarks:

Native replaceAll vs regex replace vs replace with String.raw (version: 0)

Comparing performance of: replace regex vs replace All vs replace regex with String.raw

Created: 9 months ago by: Guest

Jump to the latest result

replace regex

replace All

replace regex with String.raw

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):