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replace with global regexp vs replaceAll
(version: 0)
Comparing performance of:
replace with global regexp vs replaceAll
Created:
2 years ago
by:
Guest
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Tests:
replace with global regexp
"i want to replace all the spaces in this string".replace(/ /g, "+");
replaceAll
"i want to replace all the spaces in this string".replaceAll(" ", "+");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
replace with global regexp
replaceAll
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser/OS:
Chrome 134 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=599567" width="100%" height="500px"></iframe>
replace with global regexp
4.2M/s
replaceAll
3.4M/s
View exact numbers
Test name
Executions per second
✓
replace with global regexp
4,165,288 Ops/sec
replaceAll
3,355,050 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases to understand what's being tested. **Benchmark Definition Overview** The benchmark aims to compare two different approaches for replacing spaces in a string: using a global regular expression (`/ /g`) and using the `replaceAll` method from a library. The script preparation code is empty, which means that the JavaScript engine will execute the provided script directly. There's no HTML preparation code specified either. **What's being tested?** In this benchmark, two different approaches are compared: 1. **Global regular expression (`/ /g`)**: This approach uses a regular expression to match all spaces in the input string and replaces them with an empty string. 2. **Library-based `replaceAll` method**: This approach uses the `replaceAll` method from a library ( likely a built-in JavaScript function or a third-party library) to replace all occurrences of spaces in the input string. **Options being compared** The two approaches have different pros and cons: 1. **Global regular expression (`/ /g`)**: * Pros: Fast, efficient, and widely supported. * Cons: Can be error-prone if not properly escaped, and may not work as expected with complex regex patterns. 2. **Library-based `replaceAll` method**: * Pros: More readable, safer (as it uses the built-in function), and easier to maintain than using a global regular expression. * Cons: May be slower due to the overhead of calling an external library. **Libraries being used** In this benchmark, two libraries are not explicitly mentioned, but we can infer that: 1. The `replaceAll` method is likely a built-in JavaScript function (`String.prototype.replaceAll` or its alias, `String.prototype.replaceAll`). 2. The global regular expression (`/ /g`) uses the browser's internal regex engine. **Other considerations** When testing this benchmark, consider the following factors: * Browser version: Different browsers may have varying performance and behavior for both approaches. * Input string size: Larger input strings can affect performance due to increased memory allocation and processing time. * Platform: The test environment should be consistent across different devices (e.g., desktop vs. mobile) and platforms. **Alternatives** Some alternative approaches that could be considered for this benchmark include: 1. Using a third-party library like `lodash` or `underscore`, which offer optimized string replacement functions. 2. Implementing the replacement logic in native JavaScript, avoiding built-in library calls. 3. Comparing performance with other string replacement methods, such as using a loop to iterate over the input string. Keep in mind that the specific alternatives will depend on the goals of the benchmark and the desired level of complexity.
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replaceAll vs regex replace (no prep code)
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