Benchmark: getter vs function

Script Preparation code:

var A = class A {
	get getterA() {
    	return 'a'
    }
  
  	fnA() {
    	return 'a'
    }
}

var a = new A()

Tests:

getter
var getterA = a.getterA
fn
var fnA = a.fnA()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getter
fn

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
getter	131506584.0 Ops/sec
fn	121439440.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test case on MeasureThat.net, which compares two approaches to accessing a method in a class: using a getter and using a function.

**Benchmark Definition**

The script preparation code defines a class `A` with two methods: `get`, which is implemented as a getter, and `fn`, which is implemented as a function. The script then creates an instance of the class and assigns it to variable `a`.

The HTML preparation code is empty, but it's likely that MeasureThat.net will generate some HTML environment for the benchmark.

**Test Cases**

There are two test cases defined:

1. **getter**: This test case uses the `get` method as a getter, which means it's accessing the `getterA` property of the `a` object using the dot notation (`a.getterA`). The script preparation code already defines this method.
2. **fn**: This test case uses the `fn` method as a function, which means it's calling the `fnA()` method directly on the `a` object without using the dot notation.

**Options Compared**

The two options being compared are:

* Using a getter (`a.getterA`) vs. using a function (`a.fnA()`)
* Accessing a property via dot notation (`a.getterA`) vs. calling a method directly (`a.fnA()`)

**Pros and Cons of Each Approach**

Using a getter:
Pros:

* Can provide additional functionality or validation for the accessed value (e.g., checking if the getter is called only once)
* Can be used to implement complex logic or computations

Cons:

* Can lead to performance overhead due to method invocation
* May require additional setup or configuration

Using a function:
Pros:

* Can provide direct access to the method without any additional overhead
* Allows for more control over the method's execution (e.g., using `this` keyword)

Cons:

* Requires explicit method call, which can lead to performance overhead due to function invocation
* May not be suitable for simple property access

**Library and Special JavaScript Features**

There is no library mentioned in the benchmark definition. However, it's worth noting that some JavaScript engines (like V8) have native support for getters and setters through their `Object.defineProperty` method.

As for special JavaScript features, there are no notable mentions in this specific benchmark.

**Other Alternatives**

If you're looking to explore other options or alternatives, here are a few suggestions:

* **Array.prototype.at()**: Instead of using a getter or function, you could use the newer `at()` method on arrays (introduced in ECMAScript 2019) for property access.
* **Symbol accessor patterns**: If you need more control over property access or want to implement complex logic, consider using symbol accessor patterns, which provide a more flexible way to define getters and setters.

Keep in mind that each of these alternatives might have different performance characteristics, syntax complexities, or use cases compared to the original getter and function approaches.

Related benchmarks:

getter vs function (version: 0)

Comparing performance of: getter vs fn

Created: 2 years ago by: Registered User

Jump to the latest result

getter

fn

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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