Benchmark: Getter Setter - MeasureThat.net

Script Preparation code:

var obj = {test:1, get test2() {return 1} };
var proto = Object.getPrototypeOf(obj);
Object.defineProperty(proto, "Test", {
  get() {
    return 1;
  },
});

Tests:

Plain property
var read = obj.test;
Get property
var gread = obj.Test;
Get plain property
var read2 = obj.test2;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Plain property
Get property
Get plain property

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is defined in two parts: Script Preparation Code and Html Preparation Code. The Script Preparation Code defines a JavaScript object `obj` with a property `test` and a getter function `get test2()` for another property `test2`. The getter function returns the value `1`. Then, it creates a prototype `proto` from the `obj` using `Object.getPrototypeOf()`, and sets a property `Test` on the prototype using `Object.defineProperty()`. This sets up the benchmark with two properties: `test` (which is not accessible via getter) and `Test` (which can be accessed via getter).

**Individual Test Cases**

There are three test cases:

1. **Plain Property**: The script defines a variable `read = obj.test;`, which attempts to access the non-existent property `test` directly.
2. **Get Property**: The script defines a variable `gread = obj.Test;`, which attempts to access the existing property `Test` via getter.
3. **Get Plain Property**: The script defines a variable `read2 = obj.test2;`, which attempts to access the non-existent property `test2` directly.

**Library and Special JS Features**

* In the Script Preparation Code, the `Object.getPrototypeOf()` function is used to create a prototype chain, which is a concept in JavaScript that allows you to inherit properties from parent objects.
* The `Object.defineProperty()` function is used to define custom properties on an object, including getters and setters. This is not a built-in feature of JavaScript, but rather a standard library function provided by the ECMAScript specification.

**Options Compared**

The benchmark compares three different approaches:

1. **Plain Property**: Directly accessing a non-existent property (`obj.test`).
2. **Get Property**: Accessing an existing property via getter (`obj.Test`).
3. **Get Plain Property**: Directly accessing a non-existent property via getter (`obj.test2`).

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Plain Property**:
	* Pros: Simple, straightforward access.
	* Cons: May not work as expected if the property does not exist.
2. **Get Property**:
	* Pros: Works even if the property does not exist (returns undefined).
	* Cons: Requires the use of getter functions, which may be less intuitive.
3. **Get Plain Property**:
	* Pros: Similar to Get Property, but uses direct access instead of getter functions.
	* Cons: May not work as expected if the property does not exist.

**Other Considerations**

In addition to these options, it's worth noting that the benchmark also considers the following factors:

* **Device Platform**: The benchmark is run on a Windows desktop device, which may have specific implications for JavaScript execution.
* **Operating System**: The benchmark runs on Windows 10, which may affect JavaScript behavior.

**Alternatives**

Some alternative approaches could be considered in this benchmark:

* Using `in` operator to check if the property exists before accessing it.
* Using a try-catch block to handle errors when accessing non-existent properties.
* Using a different data structure or approach that avoids these issues altogether.

Related benchmarks:

Getter Setter (version: 0)

Comparing performance of: Plain property vs Get property vs Get plain property

Created: 2 years ago by: Guest

Jump to the latest result

Plain property

Get property

Get plain property

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):