Benchmark: days in month - MeasureThat.net

Script Preparation code:

function manual(date) {
  const year = date.getFullYear();
  const month = date.getMonth();
  const isLeapYear = ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0);

  return [31, (isLeapYear ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
}

function withDate(date){
    var d= new Date(date.getFullYear(), date.getMonth()+1, 0);
    return d.getDate();
}

var date = new Date(2000, 1, 1);

Tests:

manual
for(var i=0; i<100; ++i) { manual(date); }
withDate
for(var i=0; i<100; ++i) { withDate(date); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
manual
withDate

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmarking tests provided by MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a JSON object that describes the test case. In this case, there are two benchmark definitions:

1. "days in month"
	* This is the description of the benchmark, which is empty.
2. Two script preparation codes:
	* `manual(date)`: This function calculates the number of days in a given month based on the year and month numbers.
	* `withDate(date)`: This function uses the `Date` object to calculate the number of days in a given month.

**Options Compared**

The two benchmark definitions compare the performance of two approaches:

1. **Manual calculation**: The `manual(date)` function calculates the number of days in a month manually using arithmetic.
2. **Date object usage**: The `withDate(date)` function uses the `Date` object to calculate the number of days in a month.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Manual calculation (manual(date))**:
	* Pros:
		+ Can be more accurate, as it doesn't rely on the `Date` object's internal implementation.
		+ May be faster for simple calculations.
	* Cons:
		+ More complex and error-prone, as it requires manual arithmetic.
2. **Date object usage (withDate(date))**:
	* Pros:
		+ Easier to implement and maintain, as it relies on the `Date` object's built-in functionality.
		+ Often faster, as modern browsers' JavaScript engines are optimized for date-related operations.
	* Cons:
		+ May be slower or less accurate due to the internal implementation of the `Date` object.

**Library**

There is no explicit library mentioned in the benchmark definition. However, the `Date` object is a built-in JavaScript API that provides a way to manipulate dates and times.

**Special JS feature/Syntax**

The benchmark uses the ES6 `const` keyword for variable declarations, which is a relatively new syntax introduced in 2015. It's not specific to any particular JavaScript engine or browser, so it shouldn't affect performance too much.

**Other Alternatives**

If you want to create similar benchmarks, here are some alternatives:

1. Use the `DateInterval` API (introduced in Chrome 66) instead of the `Date` object.
2. Measure the performance of manual date arithmetic using techniques like [big integer arithmetic](https://en.wikipedia.org/wiki/Big_int).
3. Compare the performance of different JavaScript engines, such as SpiderMonkey (Firefox), V8 (Chrome), or SquirrelFish (Safari).

Keep in mind that benchmarking JavaScript code can be complex and nuanced, and the results may vary depending on the specific test case, environment, and browser version used.

Related benchmarks:

days in month (version: 0)

Comparing performance of: manual vs withDate

Created: 9 years ago by: Guest

Jump to the latest result

manual

withDate

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):