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Performance Test: substring vs substr vs slice vs split for date
(version: 0)
Comparing performance of:
slice vs substring vs substr vs split
Created:
2 years ago
by:
Guest
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Script Preparation code:
var string = "2022-11-14T00:55:31.820Z"
Tests:
slice
var substring = string.slice(0, 10)
substring
var substring = string.substring(0, 10);
substr
var substring = string.substr(0, 10);
split
var substring = string.split('T')[0];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
slice
substring
substr
split
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark measures the performance of different JavaScript methods for extracting substrings from a string: `slice`, `substring`, `substr`, and `split`. The test case uses a sample date string to create multiple benchmarks. **Tested Options** 1. **`slice()`**: This method returns a new string that contains only the characters up to, but not including, the specified index. 2. **`substring()`**: This method returns a new string that contains only the characters from the start index (inclusive) to the end index (exclusive). 3. **`substr()`**: This method is an older version of `substring()`, returning a new string with the start and length specified, but without the exclusive end index. 4. **`split()`**: This method splits the string into an array of substrings, using the specified separator. **Pros and Cons of Each Approach** * **`slice()`**: * Pros: Efficient use of memory (returns a new string) and doesn't modify the original string. * Cons: Returns only characters up to the index, not including it. May be slower if `index` is near the end of the string. * **`substring()`**: * Pros: Returns the desired substring with inclusion/exclusion of the start/end indices. * Cons: May be slower than `slice()` due to more operations (string concatenation and index calculations). * **`substr()`**: * Pros: Simple implementation, efficient memory usage like `substring()`. * Cons: Only supports length and doesn't allow end index specification. May be outdated compared to modern JavaScript. * **`split()`**: * Pros: Useful for parsing strings with separators (e.g., CSV or JSON data). * Cons: Returns an array of substrings, which may require additional processing. **Library Usage** In this benchmark, no libraries are explicitly used. However, the `slice()`, `substring()`, and `substr()` methods are part of the JavaScript Standard Library. **Special JS Features/Syntax** None mentioned in the provided code. **Other Alternatives** If you're looking for alternative substring extraction methods or need to compare performance with other approaches: 1. **`indexOf()`**: Not recommended due to its lower efficiency compared to `slice()`, `substring()`, and `substr()`. 2. **Regular expressions (`regex`)**: Can be used to extract substrings using the `match()` method, which is more complex than the methods tested in this benchmark. You can explore these alternatives by experimenting with different JavaScript methods and libraries on [MeasureThat.net](http://www.measurethat.net/) or other online platforms.
Related benchmarks:
Array split vs string substring for dates
substring vs split datetime
substring vs split datetime with longer date
slice vs substring with specified start and end
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