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replaceAll vs replace 508
(version: 0)
Comparing performance of:
regex vs benchmark
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
regex
"this is it".replace(/ /g, "+");
benchmark
"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
benchmark
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Description** The provided benchmark measures the performance difference between two string replacement methods: `replace()` and `replaceAll()`. These methods are used to replace occurrences of a pattern in a string. **Options Compared** There are only two options being compared: 1. **`replace()`**: This method uses regular expressions (regex) to find and replace patterns in a string. It returns the modified string. 2. **`replaceAll()`**: This method is not a standard JavaScript method, but rather a proprietary method used by some JavaScript engines, including Firefox. It's similar to `replace()`, but with an additional option for case sensitivity. **Pros and Cons** * `replace()`: + Pros: widely supported across most JavaScript engines, efficient, and concise. + Cons: may not be as readable or maintainable due to the use of regex patterns. * `replaceAll()`: + Pros: faster performance in some cases (as seen in the benchmark result), possibly useful for specific use cases. + Cons: non-standard method, may not work across all JavaScript engines, and its behavior can vary depending on the engine implementation. **Library and Syntax** Neither of these methods uses a library. Instead, they are built-in string manipulation functions in JavaScript. **Special JS Feature or Syntax** The `replaceAll()` method is not a standard JavaScript method, but rather a proprietary method used by some JavaScript engines, including Firefox. This means that while it may be supported by some browsers, it's not guaranteed to work across all platforms and versions. **Benchmark Preparation Code** The provided script preparation code for the benchmark is simply: ```javascript this is it.replace(/ /g, "+"); ``` This code defines a string `this is it` and replaces each space character (`\s`) with a plus sign (`+`). The `/ /g` regex pattern matches one or more whitespace characters globally. **Individual Test Cases** The benchmark has two test cases: 1. **`regex`**: This test case runs the script preparation code using the `replace()` method. 2. **`benchmark`**: This test case runs the same script preparation code, but uses the proprietary `replaceAll()` method. **Latest Benchmark Result** The latest benchmark result shows that Firefox 109 performs better with the `replaceAll()` method, executing approximately 43% more times per second than the `replace()` method on a Desktop with Linux operating system.
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replaceAll vs replace regexp
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String.replace() vs String.replaceAll()
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