Benchmark: Js Split vs Regex

Script Preparation code:

var testString = "hello word"

Tests:

Splitting
var split = testString.split(' ')[0];
Regex
var regex = testString.match(/^[\w\-]+/)[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splitting
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36

Browser/OS: Chrome 147 on Windows

View result in a separate tab

Test name	Executions per second
Splitting	25818110.0 Ops/sec
Regex	22988412.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Overview**

The benchmark compares two approaches to splitting a string: using the `split()` method and regular expressions (Regex). The test creates a sample string "hello word" and measures how long it takes to split the string into words using each approach.

**Script Preparation Code**

The script preparation code defines a variable `testString` with the value "hello word". This string is used for both test cases.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmark assumes that the environment where it's run doesn't affect the result (e.g., no DOM manipulation or event handling).

**Individual Test Cases**

The benchmark has two test cases:

1. **Splitting**: This test case uses the `split()` method to split the string into words.
```javascript
var split = testString.split(' ')[0];
```
Pros: Easy to understand and implement, fast execution.

Cons: May not work correctly for all edge cases (e.g., empty strings, null or undefined input).

2. **Regex**: This test case uses a regular expression to extract the first word from the string.
```javascript
var regex = testString.match(/^[\\w\\-]+/)[0]
```
Pros: Can handle more complex string processing and edge cases.

Cons: May be slower due to the overhead of compiling the Regex pattern, and can be less readable for non-Regex experts.

**Library Used**

There is no explicit library mentioned in the benchmark definition or test cases. However, it's likely that the `split()` method uses a built-in JavaScript function under the hood.

**Special JS Feature/Syntax**

The benchmark doesn't use any special JavaScript features or syntax beyond the standard `var`, `split()`, and `Regex` functions.

**Other Alternatives**

For string splitting, alternative approaches include:

* Using an array method like `String.prototype.split()` (which is similar to the `split()` method)
* Using a library like Lodash's `str` module
* Using a custom implementation with loops or recursion

For regular expression matching, alternative approaches include:

* Using a different Regex engine or library like RegExp.js
* Using a non-Regex approach, such as string manipulation with loops or conditional statements.

In summary, the benchmark compares two simple approaches to string splitting: using `split()` and regular expressions. While both methods have their pros and cons, the `split()` method is generally faster and more straightforward to understand. The Regex approach provides more flexibility but may be slower due to compilation overhead.

Related benchmarks:

Js Split vs Regex (version: 0)

Comparing performance of: Splitting vs Regex

Created: one year ago by: Guest

Jump to the latest result

Splitting

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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