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Remove milliseconds
(version: 0)
Comparing performance of:
Split vs Regex
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var date = new Date()
Tests:
Split
let formatted = date.toISOString().split('.')[0] + 'Z' console.log(formatted)
Regex
let formatted = date.toISOString().replace(/\.\d+/, ""); console.log(formatted)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Split
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):
I'd be happy to explain the benchmark and its results. The provided JSON represents a JavaScript microbenchmarking test case for measuring the performance of two different approaches: splitting a date string using the `toISOString()` method and regular expressions (`Regex`). **Script Preparation Code** The script preparation code is: ```javascript var date = new Date(); ``` This creates a new `Date` object, which will be used as input for the benchmark. **Html Preparation Code** There is no HTML preparation code provided, which means that the test case only runs in a headless environment (e.g., Node.js or a browser's JavaScript engine). **Benchmark Definition** The benchmark definition consists of two individual test cases: 1. **Split**: This test case splits the `date.toISOString()` string into two parts using the `split()` method and takes the first part. 2. **Regex**: This test case uses regular expressions to remove milliseconds from the `date.toISOString()` string. **Library** Neither of these test cases relies on a specific JavaScript library, as they are basic implementation-specific optimizations. **Special JS Features or Syntax** There are no special JavaScript features or syntax used in this benchmark (e.g., ES6+ features like async/await, destructuring, etc.). **Other Alternatives** If you wanted to run this benchmark using alternative approaches, here are a few possibilities: 1. **String manipulation functions**: You could use built-in string manipulation functions like `substring()`, `substr()`, or `slice()` instead of `split()` and regular expressions. 2. **Template literals**: You might experiment with template literals (`${}`) to concatenate strings, potentially offering improved performance due to fewer DOM lookups. 3. **String padding methods**: Alternative methods for padding the date string could be used, like `padStart()`, `padEnd()`, or manual string concatenation. However, it's essential to note that changing these alternatives may not necessarily yield significant performance improvements and might even introduce additional complexity. The latest benchmark results show the performance of each approach on a specific device running Firefox 95: * **Regex**: ~48,404 executions per second * **Split**: ~53,477 executions per second In this case, the `split()` approach is slightly faster.
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