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Split vs regex for line numbering
(version: 0)
Comparing performance of:
Split vs Regex
Created:
4 years ago
by:
Guest
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Tests:
Split
const data = Array.from(Array(1000000).keys()) .map((x) => x + 1) .join('\n'); console.log(data.split('\n').length)
Regex
const data = Array.from(Array(1000000).keys()) .map((x) => x + 1) .join('\n'); console.log((data.match(/\n/g) || []).length + 1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Split
Regex
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and considered. **Benchmark Overview** The provided benchmark compares two approaches for line numbering: using the `split()` method versus regular expressions (`regex`). The goal is to determine which approach is faster. **Options Compared** Two options are being compared: 1. **`split()`**: This method splits a string into an array of substrings, using a specified separator (in this case, `\n`). 2. **Regular Expressions (`regex`)**: This approach uses the `match()` method with a regular expression pattern to match and count newline characters. **Pros and Cons** * **`split()`**: + Pros: Simple and widely supported, easy to read and write. + Cons: Can be slow for large strings, as it creates an array of substrings. * **Regular Expressions (`regex`)**: + Pros: Can be more efficient than `split()` for large strings, as it only counts matches without creating a new array. + Cons: More complex and less readable, requires knowledge of regular expression patterns. **Library Used** In this benchmark, the `Array.from()` method is used to create an array from a number range. This is a built-in JavaScript method that returns a new array from an iterable or array-like object. **Special JS Feature/Syntax** There are no special JavaScript features or syntaxes being tested in this benchmark. **Benchmark Preparation Code** The preparation code is empty, which means the benchmark assumes that the input data (an array of 1 million elements) has already been generated and is available for testing. **Latest Benchmark Result** The latest results show that: * **`Regex`**: The regular expressions approach executed approximately 8.4 times per second on a Chrome 94 browser on a Mac OS X 10.15.7 system. * **`Split`**: The `split()` method approached executed approximately 5.4 times per second on the same system. These results suggest that, for this particular benchmark, regular expressions are faster than using the `split()` method. **Other Alternatives** There are other approaches to line numbering that could be used in a benchmark: * **`indexOf()`**: This method searches for a specified value (in this case, `\n`) and returns its index. It can be slower than `split()` or regex for large strings. * **`substring()`**: This method extracts a section of a string using a start and end index. It can be more efficient than `split()` but less readable. In conclusion, the benchmark compares two approaches for line numbering: using the `split()` method versus regular expressions (`regex`). The results suggest that regular expressions are faster than `split()` for this particular benchmark, but the choice of approach depends on the specific requirements and constraints of the use case.
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