Benchmark: get vs proxy get v2

Script Preparation code:

var obj = {d: 10,  get x() {return this.d } }
var obj2 = {d:10}
Object.defineProperty(obj2, 'x', { get() {return this.d } })

var proxyObj = new Proxy({d: 10}, {get(target, p) {return target[p]} });

Tests:

get
let x = obj.x;
proxy
let x = proxyObj.d;
define prop
let x = obj2.x

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
get
proxy
define prop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Linux

View result in a separate tab

Test name	Executions per second
get	44928160.0 Ops/sec
proxy	24250352.0 Ops/sec
define prop	44649336.0 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 provided benchmark data and explain what is being tested, compared, and their pros/cons.

**Benchmark Overview**

The provided JSON defines a JavaScript microbenchmark that compares three approaches:

1. **Direct Property Access (`get`)**: This approach uses an object with a `d` property and an `x` getter function.
2. **Property Definition using Object.defineProperty (`define prop`)**: This approach creates a similar object but uses `Object.defineProperty` to define the `x` property with a getter function.
3. **Proxy Object (`proxy`)**: This approach creates a proxy object that forwards access to the underlying object's properties.

**What is being tested?**

The benchmark measures the execution time of accessing each property using the three different approaches.

**Options Compared**

Here's a brief overview of each option:

1. **Direct Property Access (`get`)**:
	* Pros: Simple and straightforward, no additional library or syntax required.
	* Cons: Might be slower due to indirect access via getter function.
2. **Property Definition using Object.defineProperty (`define prop`)**:
	* Pros: Can provide better control over property behavior (e.g., validation, caching).
	* Cons: Requires additional syntax and might incur overhead due to the `Object.defineProperty` method call.
3. **Proxy Object (`proxy`)**:
	* Pros: Can provide a more flexible and efficient way to handle complex property access scenarios.
	* Cons: Requires knowledge of Proxy objects and their usage, which can add complexity.

**Library Used**

None of the options explicitly use a library beyond what is built into JavaScript.

**Special JS Feature or Syntax**

The `proxy` option uses the Proxy object feature, which was introduced in ECMAScript 2015 (ES6). This feature allows creating proxy objects that intercept and modify property access.

**Benchmark Preparation Code Explanation**

The provided script preparation code sets up the three test cases:

* `obj` and `obj2` create two objects with a `d` property.
* The `x` getter function is defined for each object using an arrow function.
* A proxy object `proxyObj` is created using `new Proxy()` with a simple getter function that forwards access to the underlying object's properties.

**Individual Test Cases**

Each test case measures the execution time of accessing a specific property:

1. **Direct Property Access (`get`)**: Measures the execution time of accessing the `x` property directly on `obj`.
2. **Property Definition using Object.defineProperty (`define prop`)**: Measures the execution time of accessing the `x` property defined using `Object.defineProperty` on `obj2`.
3. **Proxy Object (`proxy`)**: Measures the execution time of accessing the `d` property on the proxy object `proxyObj`.

**Alternative Approaches**

If you're interested in exploring alternative approaches, consider:

* Using a library like Lodash or Underscore.js to implement the `x` getter function or create the proxy object.
* Implementing the `get`, `define prop`, and `proxy` approaches using a different JavaScript syntax, such as ES7's optional chaining (`?.`) or arrow functions.

Keep in mind that these alternatives might introduce additional complexity or overhead, so it's essential to weigh their pros and cons before choosing an approach.

Related benchmarks:

get vs proxy get v2 (version: 0)

Comparing performance of: get vs proxy vs define prop

Created: 3 years ago by: Guest

Jump to the latest result

get

proxy

define prop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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