Benchmark: Split vs Match - MeasureThat.net

Script Preparation code:

const str = 'March April'
const match = 'mar'

Tests:

Split
const str = 'March April' const match = 'mar' str.split(new RegExp(match, 'i'))
Match
const str = 'March April' const match = 'mar' str.match(new RegExp(match, 'gi'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Match

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36

Browser/OS: Chrome 83 on Mac OS X 10.15.4

View result in a separate tab

Test name	Executions per second
Split	3023002.2 Ops/sec
Match	3146939.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition**

The benchmark is called "Split vs Match" and it tests two different approaches to splitting or matching a string in JavaScript. The script preparation code is the following:
```javascript
const str = 'March April'\r\nconst match = 'mar'
```
This creates a string `str` with multiple lines, including the line `const match = 'mar'`. This variable `match` will be used later to test the splitting or matching functionality.

**Script Preparation Code**

The script preparation code is similar for both test cases:
```javascript
str.split(new RegExp(match, 'i'))
```
and

```javascript
str.match(new RegExp(match, 'gi'))
```
Both codes use a regular expression to search for the value of `match` in the string `str`. The `'i'` flag makes the search case-insensitive, and the `'g'` flag makes it global, so that all occurrences are found.

**Test Cases**

There are two test cases:

1. **Split**: This test case runs the code:
```javascript
str.split(new RegExp(match, 'i'))
```
It splits the string `str` into an array of substrings using the regular expression `match` as a separator.

2. **Match**: This test case runs the code:
```javascript
str.match(new RegExp(match, 'gi'))
```
It searches for the value of `match` in the string `str` using the regular expression `match` and returns an array containing all matches. The `'g'` flag makes it global, so that all occurrences are found.

**Pros and Cons**

The pros of these two approaches are:

*   **Split**: This approach can be faster when you need to process the entire string or perform additional operations on the resulting substrings.
*   **Match**: This approach is more suitable when you only need to find a specific substring within the original string.

However, there are also some cons:

*   **Split**:
    *   Requires more memory, as it creates an array of substrings.
    *   May be slower if the resulting array needs to be processed further.
*   **Match**:
    *   Can return `null` or an empty array if no match is found, which may lead to errors in your application.

**Other Considerations**

The choice between these two approaches depends on the specific requirements of your use case. If you need to process the entire string and work with multiple substrings, `Split` might be a better option. However, if you only need to find a specific substring within the original string, `Match` could be more efficient.

**Alternatives**

If you're looking for alternative approaches, consider the following:

*   **Using a library**: You can use libraries like Lodash or Ramda to simplify your code and provide additional functionality.
*   **Using a different data structure**: Depending on your requirements, using an array or a set might be more efficient than splitting or matching strings.
*   **Optimizing regular expressions**: Regular expressions can be optimized for performance by reducing the number of special characters, using character classes, or leveraging built-in flags.

In this specific case, since we're comparing `split` and `match`, it's essential to consider whether you need to process the entire string or only find a specific substring. If you're unsure, it might be helpful to use profiling tools to determine which approach is more efficient for your application.

Related benchmarks:

Split vs Match (version: 0)

Comparing performance of: Split vs Match

Created: 4 years ago by: Guest

Jump to the latest result

Split

Match

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):