Benchmark: String split using regex vs string

Script Preparation code:

var string = 'salut comment ca  va moi test pa adsk ldsj dkjasb kdaj akdajkda     dkna dlkas mas '

AخA
 
var string = 'salut comment ca  va moi test pa adsk ldsj dkjasb kdaj akdajkda     dkna dlkas mas '

Tests:

Split by regex
var res = string.split(/\s+/g)
var res = string.split(/\s+/g)

Split by string

var str = string.split(' ')
var res = []
for (var i = 0; i < str.length; i++) {
	var s = str[i].trim()
    if (s) {
      res.push(s)
    }
}

 
var str = string.split(' ')var res = []for (var i = 0; i < str.length; i++) {    var s = str[i].trim()    if (s) {      res.push(s)    }}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
Split by regex
Split by string

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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Split by regex	1701091.9 Ops/sec
Split by string	2229546.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

Let's break down the provided benchmark and explain what's being tested.

Benchmark Definition

The benchmark is testing two approaches to splitting a string: using regular expressions (regex) and using the split method with a space character (' ') as the separator.

Options Compared

Regex: The first option uses regex to split the string. The /\\s+/g pattern matches one or more whitespace characters (\\s+) globally (g) across the entire string.
String Split Method: The second option uses the split method with a space character as the separator.

Pros and Cons

Regex Approach:
- Pros: Can handle complex splitting scenarios, flexible pattern syntax, and can be used to extract specific substrings.
- Cons: Can be slower than the string split method due to the overhead of parsing and executing regex patterns. Requires knowledge of regex syntax.
String Split Method:
- Pros: Fast, lightweight, and easy to understand.
- Cons: Limited flexibility, may not work as expected with edge cases or non-standard whitespace characters.

Library/Additional Considerations

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that the regex approach uses a built-in JavaScript feature (regex patterns) to split the string.

Special JS Feature/Syntax

The benchmark defines two test cases using special syntax:

\\s+ in the regex pattern: This is a regex escape sequence for whitespace characters.
\r\n: This is a newline character. In this context, it's used as a separator in the string split method.

Other Alternatives

If you wanted to test alternative approaches, some options could be:

Using replace() with a callback function to split the string
Using a library like Lodash or underscore.js for string manipulation
Testing different string separators (e.g., tabs (\t), commas (,), etc.)
Adding more complex scenarios to handle edge cases (e.g., strings with newline characters, null/undefined values, etc.)

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing two approaches to splitting a string: using regular expressions (regex) and using the `split` method with a space character (`' '`) as the separator.

**Options Compared**

* **Regex**: The first option uses regex to split the string. The `/\\s+/g` pattern matches one or more whitespace characters (`\\s+`) globally (`g`) across the entire string.
* **String Split Method**: The second option uses the `split` method with a space character as the separator.

**Pros and Cons**

* **Regex Approach**:
	+ Pros: Can handle complex splitting scenarios, flexible pattern syntax, and can be used to extract specific substrings.
	+ Cons: Can be slower than the string split method due to the overhead of parsing and executing regex patterns. Requires knowledge of regex syntax.
* **String Split Method**:
	+ Pros: Fast, lightweight, and easy to understand.
	+ Cons: Limited flexibility, may not work as expected with edge cases or non-standard whitespace characters.

**Library/Additional Considerations**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that the regex approach uses a built-in JavaScript feature (regex patterns) to split the string.

**Special JS Feature/Syntax**

The benchmark defines two test cases using special syntax:

* `\\s+` in the regex pattern: This is a regex escape sequence for whitespace characters.
* `\r\n`: This is a newline character. In this context, it's used as a separator in the string split method.

**Other Alternatives**

If you wanted to test alternative approaches, some options could be:

* Using `replace()` with a callback function to split the string
* Using a library like Lodash or underscore.js for string manipulation
* Testing different string separators (e.g., tabs (`\t`), commas (`,`), etc.)
* Adding more complex scenarios to handle edge cases (e.g., strings with newline characters, null/undefined values, etc.)

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

String split using regex vs string (version: 0)

Comparing performance of: Split by regex vs Split by string

Created: 7 years ago by: Guest

Jump to the latest result

Split by regex