Benchmark: Date creation speed

Script Preparation code:

class DayModel {
    constructor(year, month, date) {
        this.year = year
        this.month = month
        this.date = date
    }

    /**
     * Checks if the passed CalendarDate is equal to itself.
     */
    isEqual(day) {
        if (day) {
            return (
                this.year === day.year &&
                this.month === day.month &&
                this.date === day.date
            )
        }
        return false
    }

    toDate() {
        return new Date(this.year, this.month, this.date)
    }

    /**
     * Returns a new DayModel which is incremented based on the value passed.
     */
    incrementBy(value) {
        // Creating new Javascript Date object to increment because
        // it will automatically take care of switching to next or previous
        // months & years without we having to worry about it.
        const date = new Date(this.year, this.month, this.date + value)
        return new DayModel(date.getFullYear(), date.getMonth(), date.getDate())
    }

    /**
     * Clones the current day model.
     */
    clone() {
        return new DayModel(this.year, this.month, this.date)
    }

    toComparisonString() {
        return `${this.year}${this.pad(this.month)}${this.pad(this.date)}`
    }

    toDateString() {
        return this.toDate().toLocaleDateString(undefined, {
            weekday: "long",
            month: "long",
            day: "numeric",
            year: "numeric"
        })
    }

    /**
     * Compares the dates and returns boolean value based on the value passed
     */
    isBefore(day, dayInclusive = false) {
        return dayInclusive ?
            this.toDate().getTime() <= day?.toDate().getTime() :
            this.toDate().getTime() < day?.toDate().getTime()
    }

    /**
     * Compares the dates and returns boolean value based on the value passed
     */
    isAfter(day, dayInclusive = false) {
        return dayInclusive ?
            this.toDate().getTime() >= day?.toDate().getTime() :
            this.toDate().getTime() > day?.toDate().getTime()
    }

    pad(num) {
        return num < 10 ? `0${num}` : `${num}`;
    }
}

function getDaysInMonthJS(month, year) {
    const date = new Date(year, month, 1);
    const days = [];
    while (date.getMonth() === month) {
        days.push(new Date(date));
        date.setDate(date.getDate() + 1);
    }
    return days;
}

function getDaysInMonthTS(month, year) {
	const nbD = new Date(year, month + 1, 0).getDate();
    return Array(nbD)
      .fill(null)
      .map((_date, index) => {
        return new DayModel(year, month, index + 1);
      });
}

Tests:

Plain JS
getDaysInMonthJS(2024, 1)
Day Class
getDaysInMonthJS(2024, 1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Plain JS
Day Class

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Browser/OS: Firefox 129 on Windows

View result in a separate tab

Plain JS

7.5M/s

Day Class

6.1M/s

View exact numbers

Test name	Executions per second
✓ Plain JS	7,507,374 Ops/sec
Day Class	6,122,255 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its options.

**Benchmark Definition**

The benchmark definition is represented by the JSON provided at the top. It describes a class `DayModel` with various methods, including:

* `constructor(year, month, date)`
* `isEqual(day)`
* `toDate()`
* `incrementBy(value)`
* `clone()`
* `toComparisonString()`
* `toDateString()`
* `isBefore(day, dayInclusive = false)`
* `isAfter(day, dayInclusive = false)`
* `pad(num)`

**Options being compared**

The benchmark compares two options:

1. **Plain JS**: This option uses the built-in JavaScript functions to implement the `getDaysInMonth` function. It creates a new `Date` object for each month and increments it by 1 day in a while loop.
2. **Day Class**: This option uses a custom class `DayModel` that represents a date. The `getDaysInMonthJS` function creates an array of `DayModel` objects representing the days in the specified month.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Plain JS**:
	+ Pros: Lightweight, easy to implement.
	+ Cons: May be slower due to the overhead of creating new `Date` objects and the while loop.
* **Day Class**:
	+ Pros: More efficient, as it avoids the overhead of creating new `Date` objects and uses a more optimized data structure (an array of dates).
	+ Cons: Requires more code and setup.

**Library usage**

The `getDaysInMonthJS` function uses a custom class `DayModel`, which is not a built-in JavaScript library. The purpose of this class is to provide a convenient way to represent dates and perform date-related operations.

**Special JS feature or syntax**

This benchmark does not use any special JavaScript features or syntax, such as async/await, Promises, or ES6 modules.

**Alternatives**

Other alternatives for implementing the `getDaysInMonth` function could be:

* Using a library like moment.js
* Using a built-in function like `Date.getMonth()` and `Date.getDate()`
* Using a different data structure, such as an array of dates with a timestamp

However, these alternatives may not provide the same level of efficiency or convenience as the `Day Class` approach.

Date creation speed (version: 0)

Comparing performance of: `Plain JS vs Day Class`

Created: 2 years ago by: Guest

Go to the latest result

Plain JS

Day Class

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Date creation speed (version: 0)

Comparing performance of: Plain JS vs Day Class

Created: 2 years ago by: Guest

Go to the latest result

Plain JS

Day Class

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Plain JS vs Day Class`