Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Demo benchmark
(version: 0)
From https://benchmarkjs.com/
Comparing performance of:
RegExp#test vs String#indexOf vs String#match
Created:
8 years ago
by:
Registered User
Jump to the latest result
HTML Preparation code:
<div>This is demo</div>
Script Preparation code:
var rx = /o/; console.log("js preparation");
Tests:
RegExp#test
rx.test('Hello World!');
String#indexOf
'Hello World!'.indexOf('o') > -1;
String#match
!!'Hello World!'.match(rx);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
RegExp#test
String#indexOf
String#match
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of JavaScript microbenchmarks is crucial in understanding how different browsers and devices execute JavaScript code efficiently. The provided JSON represents a benchmark test case created using Benchmark.js, a popular JavaScript benchmarking library. The benchmark aims to measure the execution speed of three common string manipulation operations: `String#indexOf`, `RegExp#test`, and `String#match`. **Benchmark Options Compared** 1. **String#indexOf**: This method checks if a specified substring is present in the original string. It iterates over the characters of the original string, comparing each character to the first character of the search string. * Pros: Simple and widely supported across browsers. * Cons: Can be slow for large strings due to the linear iteration process. 2. **RegExp#test**: This method uses a regular expression (regex) to match the specified pattern in the original string. It's more efficient than `String#indexOf` because regex engines are optimized for pattern matching, but it can still perform well if the pattern is not too complex. * Pros: Can handle patterns with multiple characters and is often faster than `String#indexOf`. * Cons: May have slower performance due to the overhead of parsing and executing regular expressions. 3. **String#match**: This method searches for a full match of the specified pattern in the original string, returning true if found or false otherwise. * Pros: Can be faster than `RegExp#test` when searching for an exact match with simple patterns. * Cons: May not support regex patterns and can perform slower than `RegExp#test` due to its simpler implementation. **Library Usage** The test cases utilize the following libraries: 1. **Rx**: A regular expression pattern used in the test case for `!!'Hello World!'.match(rx)`. Rx is a global regular expression pattern used by some JavaScript implementations, including V8. * Purpose: The regex pattern `rx` checks if the string `'Hello World!'` matches certain characters (`o`) with the `rx.test()` method. **Special JS Features** The benchmark doesn't mention any special JavaScript features or syntaxes like ES6 classes, async/await, or modules, as they are not directly related to the test cases' operations. However, it's worth noting that using modern JavaScript features can impact performance due to various factors such as parsing and compilation overhead. **Other Alternatives** If you need to measure different string manipulation operations or explore alternative approaches, consider these alternatives: * **Benchmark.js alternatives:** You can use other benchmarking libraries like Benchmark.js competitors, like Jest's `benchmark` module or the built-in `performance.now()` method for measuring execution time. * **Custom implementations:** Write custom JavaScript functions to test specific scenarios or optimize existing ones. This approach allows you to fine-tune your implementation according to your needs. By understanding how different benchmark options are compared and knowing the libraries used, you can create effective benchmarks for testing JavaScript performance in various scenarios.
Related benchmarks:
GBCR Sequential (2)
GBCR Sequential Intense
~~ vs math.floor test
Arrays Destructuring
querySelectorAll vs getElementsByTagName iteration star
Comments
Confirm delete:
Do you really want to delete benchmark?