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Date.parse day of week vs new Date day of week
(version: 0)
Comparing performance of:
new Date vs Date.parse
Created:
3 years ago
by:
Guest
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Tests:
new Date
a = new Date('1970-01-01');a.getUTCDay();
Date.parse
a = Date.parse('1970-01-01');(a / 86400000 + 4) % 7;
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
new Date
Date.parse
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 and explain what's being tested. **Overview** The benchmark compares two ways to get the day of the week for a specific date in JavaScript: using the `Date` object's `getUTCDay()` method versus parsing the date string with `Date.parse()`. The test aims to determine which approach is faster. **Options Compared** There are only two options being compared: 1. **new Date**: This option uses the `Date` constructor to create a new instance, passing a specific date string ('1970-01-01'). It then calls the `getUTCDay()` method on this object. 2. **Date.parse**: This option parses a specific date string ('1970-01-01') using the `Date.parse()` function and calculates the day of the week by dividing the result by 86400000 (the number of milliseconds in a day), adding 4 to account for January 1st being a Sunday, and then taking the remainder modulo 7. **Pros and Cons** * **new Date**: This approach is concise and easy to read. However, it may not be as efficient as parsing the date string directly, since it involves creating an unnecessary `Date` object. * **Date.parse**: This approach is more explicit about what it's doing, but it might be less readable due to the complex calculation involved. **Other Considerations** It's worth noting that both approaches have some limitations: * The `getUTCDay()` method returns a value between 0 (Sunday) and 6 (Saturday). If you need to account for January 1st being a Sunday, this is one way to do it. * Using `Date.parse` with a specific date string can be brittle if the input format changes. **Library/Functionality Usage** In this benchmark, neither option uses any external libraries. The `Date` object and its methods are built-in JavaScript functionality. **Special JS Features/Syntax** This benchmark does not use any special JavaScript features or syntax that would affect the execution of the tests. It's a straightforward comparison between two well-known functions in the JavaScript standard library. **Alternatives** If you wanted to add more options to this benchmark, you could consider the following alternatives: * Using `Intl.DateTimeFormat` to format the date string and get the day of the week * Using a third-party library like Moment.js or Luxon for parsing dates and calculating the day of the week * Comparing different locales (e.g., using `Date.prototype.toLocaleString()` with different locale settings) However, these alternatives would likely change the nature of the benchmark significantly, so it's worth considering whether they're relevant to your specific use case.
Related benchmarks:
Date.parse vs new Date from string
new Date(Date.parse()) vs new Date
Date.parse vs new Date()
Date.parse string vs new Date ms
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