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starts with
(version: 0)
Comparing performance of:
indexOf vs regex
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var re = /^--/ var name = '--myProperty';
Tests:
indexOf
name.indexOf('--') === 0;
regex
re.test(name);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
indexOf
regex
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a simple benchmark with two test cases: "indexOf" and "regex". **Benchmark Definition** The benchmark definition is a string that describes the operation being tested. In this case, there are two definitions: 1. `name.indexOf('--') === 0;` 2. `re.test(name);` These definitions represent two different operations: * The first one checks if the index of the first occurrence of `--` in the `name` variable is equal to 0. * The second one uses a regular expression (regex) to test if the `name` variable matches the regex pattern defined in the `re` object. **Script Preparation Code** The script preparation code is a JavaScript snippet that is executed before running each benchmark. In this case, it sets up two variables: * `re`: an object containing a regex pattern * `name`: a string assigned to the value `--myProperty` This code prepares the environment for the benchmark by defining the regex pattern and setting the initial value of the `name` variable. **Html Preparation Code** The html preparation code is not provided, so we'll skip this section. **Test Cases** There are two test cases: 1. **indexOf**: This test case runs the first benchmark definition: `name.indexOf('--') === 0;`. It measures the execution time of this operation. 2. **regex**: This test case runs the second benchmark definition: `re.test(name);`. It measures the execution time of this operation. **Library: RegExp** The regex library is used in both benchmark definitions. The `RegExp` object provides a way to work with regular expressions in JavaScript. In this case, the regex pattern is defined in the `re` object and used in the second test case. **Special JS Feature/ Syntax** There are no special JS features or syntax mentioned in the provided code. However, it's worth noting that MeasureThat.net likely uses a specific testing environment to ensure consistent results for different JavaScript engines and browsers. **Other Alternatives** If you're interested in running similar benchmarks, here are some alternatives: * **BenchmarkDotNet**: A popular benchmarking library for .NET, but also has extensions for JavaScript. * **js-benchmark**: A lightweight JavaScript benchmarking library that supports various testing frameworks. * **V8 Benchmark Suite**: A set of benchmarks designed to test the performance of the V8 JavaScript engine. Keep in mind that each benchmarking tool or library may have its own strengths and weaknesses, so it's essential to choose the one that best suits your needs.
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