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My Slice vs Regex
(version: 0)
Comparing performance of:
Regex vs Slice
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
let s = "abrakadabrA";
Tests:
Regex
let s = "abrakadabrA"; const [, v, t] = s.match(/^(.+?)(.)$/);
Slice
let s = "abrakadabrA"; const v = s.slice (0, -1), t = s.slice(-1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Regex
Slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser/OS:
Chrome 131 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=569435" width="100%" height="500px"></iframe>
Slice
161.4M/s
Regex
19.0M/s
View exact numbers
Test name
Executions per second
✓
Slice
161,356,000 Ops/sec
Regex
19,012,244 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark JSON and explain what's being tested. **Benchmark Definition** The `Script Preparation Code` defines two variables: `s` and its value is set to `"abrakadabrA"`. This variable will be used as input for the benchmark test cases. **Test Cases** There are two test cases: 1. **Regex**: The benchmark definition uses a regular expression (`/^(.+?)(.)$/`) to extract two substrings from `s`: `v` and `t`. * Purpose: To measure the performance of using regular expressions for substring extraction. 2. **Slice**: The benchmark definition uses the `slice()` method to extract two substrings from `s`: `v` and `t`. **Options Compared** The two test cases compare: 1. Regular expression-based approach (Regex) 2. String slicing approach (Slice) **Pros and Cons of Each Approach** 1. **Regular Expression-based Approach (Regex)**: * Pros: + Can extract specific patterns from a string efficiently. + Allows for more flexibility in terms of pattern matching. * Cons: + Can be slower due to the overhead of regular expression parsing. + May not perform well on large strings or complex patterns. 2. **String Slicing Approach (Slice)**: * Pros: + Generally faster and more efficient than regular expressions. + Can take advantage of caching and optimization techniques. * Cons: + Limited to extracting substrings using a fixed length. + May not be suitable for complex pattern matching. **Other Considerations** 1. **Library Usage**: The benchmark uses the `match()` method, which is part of the JavaScript String prototype. This method returns an array containing matches and their corresponding full match information. 2. **Special JS Feature or Syntax**: There are no special features or syntax used in this benchmark. **Alternatives** If you want to explore other approaches, you can consider: 1. Using a dedicated string processing library like `String.prototype.replace()` or `String.prototype.search()`. 2. Implementing custom substring extraction functions using bitwise operations or other low-level techniques. 3. Using a different data structure, such as an array or object, to represent the input string. However, these alternatives are likely to be less efficient and may not provide significant performance improvements over the current benchmark results.
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