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Date.now() vs performance.now()
(version: 0)
Comparing performance of:
Date.now() vs performance.now()
Created:
5 years ago
by:
Guest
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Tests:
Date.now()
Date.now();
performance.now()
performance.now();
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()
performance.now()
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition** The benchmark definition is an object with three properties: `Name`, `Description`, and two optional properties `Script Preparation Code` and `Html Preparation Code`. However, in this case, both of these properties are null. The `Name` field specifies the name of the benchmark, which is "Date.now() vs performance.now()". The `Description` field is empty, which means no description for this benchmark. **Individual Test Cases** The benchmark has two individual test cases: 1. `Date.now()`: This test case measures the time taken by the `Date.now()` function to execute. 2. `performance.now()`: This test case measures the time taken by the `performance.now()` function to execute. **Libraries and Special Features** Neither of the test cases uses any external libraries, so there's no library to describe. However, both functions are built-in JavaScript methods: * `Date.now()`: Returns the number of milliseconds since January 1, 1970, at 00:00:00 UTC. * `performance.now()`: Returns the number of microseconds since performance timing began. **Options Compared** The two test cases compare the time taken by `Date.now()` and `performance.now()` to execute. The main difference between these two functions is their resolution: * `Date.now()` returns milliseconds, which may not be precise enough for high-performance applications. * `performance.now()` returns microseconds, which provides a more precise measurement of time. **Pros and Cons** Here's a summary of the pros and cons of each function: `Date.now()` Pros: * Widely supported across different browsers and platforms * Simple to use Cons: * May not provide sufficient precision for high-performance applications * Can be affected by various factors, such as timezone changes and system clock updates `performance.now()` Pros: * Provides a more precise measurement of time (microseconds) * Less affected by external factors compared to `Date.now()` Cons: * Limited support on older browsers and platforms * May not work in older JavaScript engines or environments **Other Alternatives** If you need a different way to measure time, here are some alternatives: 1. `new Date().getTime()` (similar to `Date.now()`) 2. `requestAnimationFrame()` with a callback function (for more precise timing) 3. Web APIs like `navigator.mediaDevices.getUserMedia()` or `performance.getEntriesByType('resource')` for measuring performance Keep in mind that each of these alternatives has its own trade-offs and limitations, so choose the one that best suits your specific use case. In this benchmark, it's clear that the user is interested in comparing the execution time of two built-in JavaScript functions with different precision. The results will help users understand which function to use depending on their specific requirements.
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