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Replace String vs Replace Regex
(version: 0)
Comparing performance of:
replace string vs replace regex
Created:
2 years ago
by:
Guest
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Tests:
replace string
"this is it".replace(" ", "+");
replace regex
"this is it".replace(/ /g, "+");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
replace string
replace regex
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
8 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Browser/OS:
Chrome 142 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=622182" width="100%" height="500px"></iframe>
replace string
30.3M/s
replace regex
14.8M/s
View exact numbers
Test name
Executions per second
✓
replace string
30,305,400 Ops/sec
replace regex
14,849,595 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and analyze what's being tested. **Benchmark Overview** The benchmark is comparing two approaches to replace a string in JavaScript: using the `replace()` method with a regular expression (regex) vs using the `replace()` method with a simple string replacement. The goal is to determine which approach is faster for a given input string. **Options Compared** Two options are being compared: 1. **String Replacement**: This approach uses the `replace()` method with a simple string literal (`" \"`). It's a straightforward and easy-to-understand approach. 2. **Regex Replacement**: This approach uses the `replace()` method with a regex pattern (`/ /g`). Regex patterns allow for more complex matching and replacement rules. **Pros and Cons of Each Approach** * **String Replacement**: + Pros: Easy to understand, simple implementation, likely to be faster for small strings. + Cons: May not work as expected for larger or more complex strings, may not support advanced character classes or escape sequences. * **Regex Replacement**: + Pros: Can handle complex matching and replacement rules, supports advanced character classes and escape sequences. + Cons: More complex implementation, likely to be slower than string replacement for small strings. **Library Usage** There is no explicit library mentioned in the benchmark definition. However, it's likely that the `replace()` method is a built-in JavaScript method that uses regular expressions under the hood (although this is not explicitly stated). **Special JS Feature or Syntax** The benchmark does not use any special JavaScript features or syntax beyond the basics of JavaScript strings and regex patterns. **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: * **Using `String.prototype.replace()` with a callback function**: Instead of using a regex pattern, you could pass a callback function to the `replace()` method. This approach would allow for more control over the replacement process and might be faster than using regex. * **Using `Intl.PluralRules`**: If you need to perform locale-dependent string replacements, you could use the `Intl.PluralRules` API to perform the replacement. Here's an example of how you could implement the "replace string" test case using a callback function: ```javascript const str = 'this is it'; const replacer = (match) => '+'[match.length]; console.log(str.replace(/ /g, replacer)); ``` And here's an example of how you could use `Intl.PluralRules` to perform locale-dependent string replacements: ```javascript const str = 'one item'; const pluralizer = new Intl.PluralRules('en-US'); console.log(pluralizer.format(1) + ' items'); ```
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