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slice vs regex
(version: 0)
foo
Comparing performance of:
slice vs regex vs brackets
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var strIn = '1234-12-34 05:27:56Z'; var strOut = ''; var regex = /\d{4}-(\d{2})-(\d{2}) (\d{2})/;
Tests:
slice
var month = strIn.slice(5, 7); var day = strIn.slice(8, 10); var hour = strIn.slice(11, 13);
regex
var [_, month, day, hour] = strIn.match(regex)
brackets
var month = strIn[5] + strIn[6]; var day = strIn[8] + strIn[9]; var hour = strIn[11] + strIn[12];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
regex
brackets
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
7 days ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0
Browser/OS:
Firefox 152 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=633422" width="100%" height="500px"></iframe>
brackets
1412.8M/s
slice
1383.1M/s
regex
17.9M/s
View exact numbers
Test name
Executions per second
✓
brackets
1,412,826,240 Ops/sec
slice
1,383,141,888 Ops/sec
regex
17,900,016 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark, "slice vs regex", tests the performance of three different approaches to extract specific parts from a string: using `slice()`, using regular expressions (`regex`), and using bracket notation (`brackets`). The goal is to determine which approach is the fastest. **Options Compared** 1. **Slice Method**: This method uses the `slice()` function to extract specific parts of the string. 2. **Regex Method**: This method uses a regular expression to match specific patterns in the string and extracts the desired parts. 3. **Brackets Method**: This method uses bracket notation (`[]`) to access specific characters in the string. **Pros and Cons of Each Approach** 1. **Slice Method** * Pros: Fast, lightweight, and easy to use for simple cases. * Cons: May not be as efficient for larger strings or more complex patterns. 2. **Regex Method** * Pros: Flexible and powerful for matching complex patterns, can handle a wide range of input formats. * Cons: Generally slower than `slice()` due to the overhead of compiling regular expressions, may be overkill for simple cases. 3. **Brackets Method** * Pros: Similar speed to `slice()`, easy to use, and doesn't require explicit string manipulation. * Cons: May not work as expected if the input string is not properly formatted or if it contains unexpected characters. **Library Used** In this benchmark, none of the methods rely on a specific library. However, regular expressions in JavaScript are implemented in the browser's engine, which may affect performance. **Special JS Features/Syntax** None mentioned explicitly, but note that JavaScript's `slice()` method is part of the ECMAScript standard and has been supported for a long time. Regular expressions (`regex`) are also a built-in feature in JavaScript and have their own syntax rules. Bracket notation (`brackets`) is not a specific library or feature in this context. **Other Alternatives** For larger-scale string manipulation, alternative approaches might include: 1. **Using `substring()`**: Another string method that can be used for substring extraction. 2. **Using `indexOf()`, `lastIndexOf()`, and concatenation**: For extracting substrings based on specific patterns or positions in the string. In summary, this benchmark tests three common methods for extracting parts from a string: using `slice()`, regular expressions (`regex`), and bracket notation (`brackets`). While each approach has its pros and cons, the slice method is generally considered the most efficient for simple cases.
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