Benchmark: Benchmark function expression vs multiple class constructors with Date

Tests:

Add a week by instantiating 3 date objects, modifying date
for(i=0; i<100000; i++){ let defaultExpireDate = new Date(new Date().setDate(new Date().getDate() + 7)); return defaultExpireDate; }
Add a week by using anonymous expression with an instantiated Date
for(i=0; i<100000; i++){ let defaultExpireDate = (curDate = new Date(), days = 7) => new Date(curDate.setDate(curDate.getDate() + days)); return defaultExpireDate(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Add a week by instantiating 3 date objects, modifying date
Add a week by using anonymous expression with an instantiated Date

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark compares two approaches to adding a week to a Date object:

1. **Instantiating multiple Date objects**: This approach involves creating three separate Date objects, modifying one of them by incrementing its date property, and then returning the modified Date object.
2. **Using an anonymous expression with instantiated Date**: This approach uses an arrow function (introduced in JavaScript 2015) to create a new Date object that is 7 days older than another Date object.

**Options Being Compared**

The two options being compared are:

* Creating multiple instances of Date objects and modifying one of them (`"Add a week by instantiating 3 date objects, modifying date"`).
* Using an anonymous expression with instantiated Date (`"Add a week by using anonymous expression with an instantiated Date"`).

**Pros and Cons of Each Approach**

1. **Multiple Instance Approach**:
	* Pros: Can be more explicit about the intent of the code, potentially easier to understand for some developers.
	* Cons: May result in slower performance due to the creation of multiple instances of Date objects, which can lead to increased memory allocation and garbage collection.
2. **Anonymous Expression Approach**:
	* Pros: Can be more concise and expressive, potentially leading to faster performance due to reduced overhead from creating multiple instances of Date objects.
	* Cons: May be less explicit about the intent of the code, making it harder for some developers to understand.

**Library Used**

None is explicitly mentioned in the provided benchmark definition JSON. However, the use of arrow functions (`=>`) and implicit `this` context (due to the lack of `new` keyword) suggests that modern JavaScript features are being used.

**Special JS Feature or Syntax**

The benchmark uses a feature introduced in JavaScript 2015: arrow functions (`=>`). This syntax allows for more concise code and can improve readability, but it's essential to note that not all older browsers support this feature.

**Other Alternatives**

If you wanted to explore alternative approaches, you could consider:

* Using `Date.prototype.setDate()` method on a single Date object to increment its date property.
* Creating a separate utility function or class to handle date manipulation, rather than hardcoding it within the benchmark.

Keep in mind that these alternatives might not provide any significant performance improvements and may change the intent of the code.

The provided benchmark is primarily designed to compare the performance of two approaches using modern JavaScript features. If you're interested in exploring older browsers or alternative approaches, you'll need to modify the benchmark accordingly.

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Add a week by instantiating 3 date objects, modifying date	986252.6 Ops/sec
Add a week by using anonymous expression with an instantiated Date	1251936.6 Ops/sec

Related benchmarks:

Benchmark function expression vs multiple class constructors with Date (version: 0)

Comparing performance of: Add a week by instantiating 3 date objects, modifying date vs Add a week by using anonymous expression with an instantiated Date

Created: 4 months ago by: Guest

Jump to the latest result

Add a week by instantiating 3 date objects, modifying date

Add a week by using anonymous expression with an instantiated Date

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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