Benchmark: str.match vs str.Split first result

Script Preparation code:

string = "This is a benchmark to test if matching a regex is faster that splitting a string";
regex = /\S+/gi;

Tests:

String.split
string.split(" ")[1]
Regex.match
string.match(regex)[1]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String.split
Regex.match

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

**What is tested in the provided JSON?**

The benchmark tests two different approaches to extract a value from a string:

1. **String.split**: The test uses the `split()` method of JavaScript strings, which splits the input string into an array of substrings based on a specified separator (in this case, a space).
2. **Regex.match**: The test uses regular expressions (regex) with the `match()` method to find the first match in the input string.

**Options compared**

The two approaches are compared in terms of their performance:

* String.split: This approach involves iterating through the array of substrings returned by the split() method and extracting the desired value.
* Regex.match: This approach uses a single regex operation to extract the desired value directly from the input string.

**Pros and Cons of each approach**

**String.split:**

Pros:

* Easy to understand and implement
* Works well for simple cases where the separator is a fixed value (e.g., splitting on whitespace)

Cons:

* Can be slower than Regex.match for large inputs or complex cases
* Requires iteration through an array, which can lead to performance issues

**Regex.match:**

Pros:

* Can extract values from strings more efficiently than split() for complex cases
* Works well with regular expressions that can handle multiple patterns and replacements

Cons:

* Requires a good understanding of regex syntax and patterns
* Can be slower than split() for very large or simple inputs

**Other considerations**

In this benchmark, the test case using Regex.match is comparing the first match (i.e., `[1]`) in the array returned by String.split. This simplifies the comparison to focus on the efficiency of extracting a single value from the input string.

**Library and its purpose**

There is no explicit library mentioned in the benchmark definition or individual test cases. However, JavaScript's built-in `String` object and regex syntax are used throughout the test.

**Special JS feature or syntax**

None are explicitly mentioned or used in this benchmark. The focus is on comparing two approaches to extract a value from a string.

**Alternatives**

Other alternatives for extracting values from strings include:

* Using String.prototype.indexOf() with a callback function
* Using a library like Lodash (e.g., _.head()) that provides efficient methods for working with arrays and strings
* Using regular expressions with the RegExp.prototype.exec() method to extract matches from an input string

However, the benchmark currently only compares two approaches: String.split and Regex.match.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36 OPR/73.0.3856.344

Browser/OS: Opera 73 on Mac OS X 11.0.0

View result in a separate tab

Test name	Executions per second
String.split	1566996.5 Ops/sec
Regex.match	521234.2 Ops/sec

Related benchmarks:

str.match vs str.Split first result (version: 0)

Test String.match with regex against String.split with string. We are splitting a string at the spaces.

Comparing performance of: String.split vs Regex.match

Created: 3 years ago by: Registered User

Jump to the latest result

String.split

Regex.match

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):