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Date.now vs new Date
(version: 0)
Comparing performance of:
Date.Now vs New Date
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
let timestamp = null
Tests:
Date.Now
timestamp = Date.now()
New Date
timestamp = new Date();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Date.Now
New Date
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 break down the provided benchmark definition and explain what is being tested. **What is being tested?** The benchmark tests two approaches to get the current timestamp in JavaScript: `Date.now()` and `new Date()`. The goal is to determine which approach is faster. **Options compared:** There are two options being compared: 1. **`Date.now()`**: This method returns the number of milliseconds since the Unix Epoch (January 1, 1970, 00:00:00 UTC) as an integer. It's a simple and efficient way to get the current timestamp. 2. **`new Date()`**: This constructor creates a new `Date` object with the current date and time. While it returns a `Date` object, it doesn't provide a direct way to get the timestamp. **Pros and Cons:** * **`Date.now()`**: + Pros: - Fast and efficient - Returns an integer value that can be used directly in calculations or comparisons + Cons: - Only available in ECMAScript 2015 (ES6) and later versions * **`new Date()`**: + Pros: - Widespread support across older JavaScript engines and browsers + Cons: - Returns a `Date` object, which can be slower to process than an integer value - Not suitable for all use cases (e.g., when working with dates and times) **Other considerations:** * The benchmark is running in a desktop environment with Chrome 87 on a Mac OS X 10.15.7. * The `timestamp` variable is initialized to `null` before the test case starts. **Library and syntax analysis:** There are no libraries or special JavaScript features mentioned in this benchmark definition. **Benchmark preparation code:** The script preparation code creates an empty `timestamp` variable, which will be used to store the current timestamp. The HTML preparation code is not provided, as it's likely that no HTML-related setup is needed for this simple benchmark. **Other alternatives:** If you wanted to compare these approaches in a different context or with additional options, some alternative benchmarks could include: * Comparing `Date.now()` and `new Date()` against other timestamping methods (e.g., `performance.now()`, `requestAnimationFrame`) * Including more modern JavaScript features (e.g., arrow functions, destructuring) to see their impact on performance * Adding multiple test cases with different inputs or edge cases to ensure the results are representative of real-world scenarios Overall, this benchmark provides a good starting point for understanding the differences between `Date.now()` and `new Date()` in JavaScript.
Related benchmarks:
Date.now() vs new Date()
Date.now() vs new Date().valueOf()
Date.now() vs new Date
Date.now() - Date.now() vs new Date() - new Date()
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