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().setDate() + 1)); 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.

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The test compares two approaches to add a week to a Date object: one using multiple class constructors and another using an anonymous function expression.

**Benchmark Description**

The benchmark measures the performance difference between two methods:

1. **Multiple Class Constructors**: This approach creates three separate instances of the Date class, modifies each instance, and then returns one of them. The idea is to create a new instance every time, which can be slower due to the overhead of object creation.
2. **Anonymous Function Expression**: This approach uses an anonymous function expression with an instantiated Date object as its argument. The expression calculates the date by adding 7 days to the input date and returns the result.

**Options Compared**

The benchmark compares two options:

* Option A: Multiple Class Constructors
* Option B: Anonymous Function Expression

**Pros and Cons of Each Approach**

1. **Multiple Class Constructors**
	* Pros:
		+ Easier to understand and read, especially for those familiar with Date objects.
		+ Can be more readable when working with complex date calculations.
	* Cons:
		+ Creates multiple instances of the Date class, which can lead to performance overhead.
2. **Anonymous Function Expression**
	* Pros:
		+ More concise and efficient, as it avoids creating multiple instances.
		+ Can take advantage of closures (function scope) for more complex calculations.
	* Cons:
		+ May be less readable for developers unfamiliar with anonymous functions or closures.

**Library and Syntax Used**

In the benchmark, no specific libraries are used beyond built-in JavaScript functionality. The syntax includes:

1. **Multiple Class Constructors**: Standard JavaScript syntax for creating Date objects using the `new` keyword.
2. **Anonymous Function Expression**: JavaScript syntax for defining an anonymous function using the arrow function syntax (`=>`) and invoking it like a regular function.

**Special JS Features or Syntax**

The benchmark uses a feature of modern JavaScript, specifically:

1. **Arrow Functions** (introduced in ECMAScript 2015): The `() =>` syntax is used to define an anonymous function expression with no explicit return keyword.

Overall, the benchmark provides insight into the performance difference between two approaches to adding a week to a Date object, allowing developers to optimize their code based on the specific requirements of their project.

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	2363567.2 Ops/sec
Add a week by using anonymous expression with an instantiated Date	2370298.0 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):