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REPLACE STRSUBTR VS REGEX REPLACE
(version: 0)
Comparing performance of:
str substr replace vs regex replace
Created:
6 years ago
by:
Guest
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Tests:
str substr replace
var x = 0; var TOTAL_STRINGS = 1000; var data = "00000000000000000000"; while (x < TOTAL_STRINGS) { const str = data.substr(0,5) + '1' + data.substr(6); x += 1; }
regex replace
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = "00000000000000000000"; const regex = /(\w{5})0(.*)/gm; const subst = `$11$2`; while (x < TOTAL_STRINGS) { const str = data.replace(regex,subst); x += 1; }
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Suite status:
<idle, ready to run>
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Test case name
Result
str substr replace
regex replace
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N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents two microbenchmarks that compare the performance of two different string replacement approaches: `str.substr()` and regular expression (`regex`) with substitution. **Options Compared** The benchmarks test three options: 1. **Str Substr**: Using the `substr` method to replace a substring in a string. 2. **Regex Replace**: Using regular expressions with the `replace` method to replace a pattern in a string. 3. **None**: No replacement is performed ( likely for reference or baseline purposes). **Pros and Cons of Each Approach** ### Str Substr * **Pros**: + Simple and straightforward implementation + Fast, especially for small strings * **Cons**: + Not designed for complex patterns or regular expressions + Can be slow for large strings due to repeated function calls ### Regex Replace * **Pros**: + Powerful for matching complex patterns + Fast for larger strings using optimized engine (in Firefox) * **Cons**: + More complex implementation, which can lead to slower execution + May have higher memory overhead due to the creation of a regex object **Library/Function Considerations** The `substr` method is a built-in JavaScript function, and its performance is largely dependent on the engine used by the browser. The `replace` method with regular expressions uses the browser's built-in regex engine. **Special JS Feature/Syntax** None mentioned in this benchmark. **Other Alternatives** If you wanted to add additional alternatives or variations to this benchmark, here are some ideas: * **String Replace**: Using a simple string replacement approach without substrings (e.g., using `indexOf` and `slice`) * **Regex Escape**: Testing the performance of escaping strings for regex patterns * **Array-Based Replacement**: Replacing an array of substrings or values instead of a single substring Keep in mind that adding new alternatives should be done carefully to ensure the benchmark remains relevant and meaningful.
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