Benchmark: Split vs Regex (working)

Script Preparation code:

var testString = "testing\nNewlines\nBleh"

Tests:

Splitting
var values = testString.split("\n"); var value1 = values[0]; var value2 = values[1]; var value3 = values[2];
Regex
var regex = testString.match(/.+((?=\n)|$)/g) var value1 = regex[0]; var value2 = regex[1]; var value3 = regex[2];

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: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0

Browser/OS: Firefox 102 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Splitting	9880450.0 Ops/sec
Regex	8812837.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches: splitting a string using `split()` and using regular expressions (`regex`).

**Split() vs Regex**

The test case uses a string `testString` containing multiple newlines (`\n`). The goal is to split this string into individual lines and extract the first three values.

**Split() Approach**

```javascript
var values = testString.split("\n");
var value1 = values[0];
var value2 = values[1];
var value3 = values[2];
```

Pros:

* Simple and straightforward approach.
* Well-supported by most browsers.

Cons:

* May not be efficient for very large strings, as it creates an array of substrings and then extracts the desired elements.
* Can be slower than regex for certain edge cases.

**Regex Approach**

```javascript
var regex = testString.match(/.+((?=\\n)|$)/g);
var value1 = regex[0];
var value2 = regex[1];
var value3 = regex[2];
```

Pros:

* More flexible and powerful approach, allowing for matching multiple patterns or capturing groups.
* Can be more efficient than splitting for very large strings.

Cons:

* Requires a deeper understanding of regular expressions, which can be complex and difficult to optimize.
* May not work as expected in all browsers or environments (e.g., older browsers may have issues with regex).

**Library: String.prototype.split()**

The `split()` method is a built-in JavaScript method that splits an array-like object (including strings) into an array of substrings. This library is included in most browsers and Node.js environments.

**Special JS Feature/Syntax**

There are no special features or syntaxes being tested in this benchmark.

**Other Alternatives**

For splitting strings, other approaches include:

* Using `String.prototype.split()` with a custom separator (e.g., `testString.split("|")`)
* Using a library like `lodash.string` for string manipulation
* Using a different string processing algorithm, such as using `Array.prototype.map()` or `Array.prototype.filter()`

For regex, other approaches include:

* Using `String.prototype.match()` with a custom pattern (e.g., `/[^\\n]+/g`)
* Using a library like `lodash.regex` for regular expression manipulation
* Using a different string processing algorithm, such as using `Array.prototype.map()` or `Array.prototype.filter()`

Overall, the benchmark provides a simple and clear comparison between two approaches to splitting strings in JavaScript.

Related benchmarks:

Split vs Regex (working) (version: 0)

Comparing performance of: Splitting vs Regex

Created: 3 years ago by: Guest

Jump to the latest result

Splitting

Regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):