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find until delimeter: split vs indexOf vs regexp
(version: 0)
Comparing performance of:
split, shift vs indexOf vs regexp match vs regexp exec
Created:
4 years ago
by:
Guest
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Script Preparation code:
var str = "1.2.3.4,5.6.7.8"
Tests:
split, shift
str.split(',').shift()
indexOf
var index = str.indexOf(',') str.slice(0, index)
regexp match
var match = str.match(/^(^,)+,/)
regexp exec
var match = /^(^,)+,/.exec(str)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
split, shift
indexOf
regexp match
regexp exec
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested. **Overview** The test compares three different approaches to split a string until a specified delimiter: 1. `str.split(',')` 2. `str.indexOf(',')` followed by `str.slice(0, index)` 3. Regular expression matching (`^$(^,)+,$`) using both `match()` and `exec()` methods **Options being compared** * **Split**: Using the built-in `split()` method to split the string at the specified delimiter. * **IndexOf + Slice**: Using the `indexOf()` method to find the index of the first occurrence of the delimiter, and then slicing the original string from the beginning up to that index using `str.slice(0, index)`. * **Regular Expression (Regexp)**: Using regular expressions to match the specified delimiter. There are two test cases: + `match()`: Uses the `match()` method to search for a match in the string. + `exec()`: Uses the `exec()` method to execute a regular expression search on the string. **Pros and Cons** * **Split**: Fast, efficient, and widely supported. However, it may not be suitable for non-delimiter characters (e.g., commas within the string). * **IndexOf + Slice**: More flexible than Split, as it can handle non-delimiter characters. However, it requires an additional function call to get the index, which might be slower. * **Regexp**: Powerful and flexible, but also more complex and less intuitive than Split or IndexOf+Slice. It may require more processing power, especially for large strings. **Other considerations** * The benchmark does not account for edge cases like empty strings, null/undefined input, or escaped characters. * The test assumes that the delimiter is a single character; if it's a multi-character string, the results would be different. **Libraries and special JS features** * The `match()` method uses regular expressions internally. * The `exec()` method also uses regular expressions internally, but with slightly different behavior (e.g., no need to compile the regex pattern). * No special JavaScript features or syntax are used in this benchmark (no ES6+ syntax, async/await, etc.). **Alternatives** Other approaches could be considered for splitting a string until a specified delimiter: * Using `substr()` or `substring()` methods * Using `replace()` method with a regular expression replacement * Using a library like Lodash's `split()` However, the built-in `split()` and `indexOf()` methods are likely to remain popular choices due to their simplicity, efficiency, and widespread support.
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