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str split vs regex replace
(version: 0)
Comparing performance of:
split vs regex
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var str = '1234563242347.341342345'; var regex = /\..*$/;
Tests:
split
str.split('.')[0];
regex
str.replace(regex, '');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
split
regex
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser/OS:
Firefox 133 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=573783" width="100%" height="500px"></iframe>
regex
22.5M/s
split
13.5M/s
View exact numbers
Test name
Executions per second
✓
regex
22,511,514 Ops/sec
split
13,533,983 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation. **Benchmark Overview** The provided benchmark is designed to compare two approaches for splitting or replacing a string: using the `str.split()` method versus using regular expressions (regex). The goal of this benchmark is to determine which approach performs better in terms of execution speed. **Options Compared** Two options are compared: 1. **`str.split('.')[0]`**: This option uses the `split()` method with a dot (`.`) as the separator and then selects the first substring using indexing (`[0]`). The purpose of this method is to split the input string at the decimal point and return only the part before the decimal. 2. **`str.replace(regex, '')`**: This option uses regular expressions (regex) to replace all occurrences of a pattern with an empty string (`''`). In this case, the regex pattern `\\..*//` is used to match any character followed by zero or more asterisks (`.*`), effectively removing everything after the first dot (`.`). **Pros and Cons** Both approaches have their trade-offs: 1. **`str.split('.')[0]`**: * Pros: Simple, easy to understand, and widely supported. * Cons: May not work correctly for strings containing multiple dots or different separators (e.g., commas). 2. **`str.replace(regex, '')`**: * Pros: Flexible and can handle complex patterns, but may be slower due to the overhead of regular expressions. * Cons: Can be more difficult to read and understand, especially for beginners. **Other Considerations** When choosing between these two approaches, consider the following: 1. **Complexity**: If you need to handle strings with multiple dots or different separators, `str.split('.')[0]` might not work as expected. 2. **Performance**: For large datasets or high-performance applications, using regular expressions might incur additional overhead, making `str.split('.')[0]` a better choice. **Library and Special JS Features** The benchmark uses the `str` variable to represent the input string and defines two scripts: one for splitting and another for replacing. There are no external libraries used in this benchmark. Additionally, there are no special JavaScript features mentioned (e.g., async/await, arrow functions). **Alternative Approaches** If you need to handle similar tasks, consider these alternative approaches: 1. **Using `str.match()` instead of `split()`:** ```javascript var match = str.match(/^...$/); ``` This approach matches the pattern at the beginning (`^`) and end (`$`) of the string using regular expressions. 2. **Using a library like Moment.js for date manipulation:** Moment.js provides a convenient API for working with dates, including parsing decimal points. Keep in mind that these alternatives may have different performance characteristics or requirements compared to the original benchmark.
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