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ReplaceAll vs Replace with regex
(version: 0)
Comparing performance of:
Regex vs Replace All
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
Regex
"this is it".replace(/ /g, "+");
Replace All
"this is it".replaceAll(' ', "+");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Regex
Replace All
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36
Browser/OS:
Chrome 146 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=627192" width="100%" height="500px"></iframe>
Regex
12.2M/s
Replace All
10.7M/s
View exact numbers
Test name
Executions per second
✓
Regex
12,174,993 Ops/sec
Replace All
10,747,493 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. The provided benchmark test compares two string replacement approaches: `replace()` with a regular expression (regex) and `replaceAll()` from a custom implementation. **What is being tested?** In the first test case, `"this is it".replace(/ /g, "+");`, we're using the built-in `replace()` method of the String object to replace all occurrences of whitespace characters (`/ /g`) with a plus sign (`+`). The regex `/ /g` matches one or more whitespace characters globally (`g` flag). In the second test case, `"this is it".replaceAll(' ', "+");`, we're using a custom `replaceAll()` method that replaces all occurrences of a specified character (in this case, a space) with another character (a plus sign). This implementation is not part of the standard JavaScript library. **Options compared** The two options being compared are: 1. **Built-in `replace()` method**: The built-in `replace()` method uses a regex engine to match and replace strings. It's a widely supported and efficient approach. 2. **Custom `replaceAll()` method**: The custom implementation of `replaceAll()` is not part of the standard JavaScript library, suggesting it might be a bespoke solution for specific use cases. **Pros and cons** 1. **Built-in `replace()` method**: * Pros: + Widely supported across browsers and Node.js environments. + Efficient and optimized by the browser's or engine's regex implementation. * Cons: + May not be as customizable as a custom implementation. 2. **Custom `replaceAll()` method**: * Pros: + Highly customizable, allowing for more specific replacement logic. * Cons: + May not be supported by all browsers or environments, potentially introducing compatibility issues. **Library usage** There is no explicit library mentioned in the provided benchmark definition. However, if a custom `replaceAll()` method were to be implemented, it might rely on a library like Lodash (specifically, the `replaceAll()` function from Lodash) for its implementation. **Special JS feature or syntax** None are explicitly mentioned in this benchmark. **Other alternatives** If you're looking for alternative string replacement methods, consider: 1. **String.prototype.replace() with a callback**: This method takes a callback function as an argument, allowing for more complex replacement logic. 2. **DOM-based string manipulation**: For specific use cases involving HTML or DOM strings, you might prefer to use browser-specific APIs like `document.getElementById().nodeValue`. Keep in mind that this benchmark is focused on comparing the performance of two specific approaches: built-in `replace()` method and custom `replaceAll()` method. If you're looking for more general string manipulation options, consider exploring other libraries or APIs available in JavaScript.
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replaceAll vs regex replace (no prep code)
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