Benchmark: setPrototypeOf to Proxy3

Script Preparation code:

simpleRef = {
    isRef: true,
    value: "bob1"
};
newProxy = new Proxy({
    newStuff: "bob2"
}, {
    get(target, key) {
        console.log(target, "key", key);
    }
});

Tests:

Setting prototype to proxy
Object.setPrototypeOf(simpleRef, newProxy); const temp = simpleRef.value + simpleRef.newStuff;
Temp
const temp = simpleRef.value + simpleRef.newStuff;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Setting prototype to proxy
Temp

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark definition defines a JavaScript microbenchmark that measures the performance of setting a prototype to an object using `Object.setPrototypeOf`. The script preparation code creates two objects: `simpleRef` with some properties, and `newProxy`, which is a proxy object created using the `Proxy` constructor. The `get` trap in the proxy logs its target, key, and value when accessed.

**Test Cases**

There are two test cases:

1. **"Setting prototype to proxy"`**: This test case runs the script preparation code and then calls `Object.setPrototypeOf(simpleRef, newProxy)`. It then measures the performance of accessing the `value` property of `simpleRef`, which now has a different prototype due to the setting.
2. **"Temp"`**: This test case only accesses the `value` property of `simpleRef` without setting its prototype.

**Options Compared**

In this benchmark, two options are being compared:

1. **Setting prototype to proxy**: This option involves creating a proxy object and then setting its prototype using `Object.setPrototypeOf`. This changes the inheritance chain of `simpleRef`.
2. **No prototype change (only accessing `value` property)**: In this case, `simpleRef` is only accessed without changing its prototype.

**Pros and Cons**

* **Setting prototype to proxy**: This approach can be beneficial when you need to modify an object's inheritance chain for specific use cases.
	+ Pros: Can improve performance by avoiding the overhead of creating a new proxy object and setting its prototype.
	+ Cons: Changes the inheritance chain of `simpleRef`, which might not be desirable in all situations.
* **No prototype change (only accessing `value` property)**: This approach is simpler and doesn't modify the inheritance chain of `simpleRef`.
	+ Pros: No potential changes to the inheritance chain, making it easier to predict behavior.
	+ Cons: Might incur a performance penalty due to the overhead of creating a proxy object.

**Library Usage**

The `Proxy` constructor is used in this benchmark to create a proxy object. The `Proxy` constructor is part of the ECMAScript standard and provides a way to create objects with custom properties that can be intercepted by traps.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. It's purely a performance test.

**Alternatives**

If you need to measure the performance of other related scenarios, here are some alternatives:

1. **Setting prototype using `Object.setPrototypeOf` with a different target object**: You can change the target object passed to `Object.setPrototypeOf` and see how it affects performance.
2. **Using `Reflect.set()` instead of `setPrototypeOf`**: `Reflect.set()` is another way to set an object's property, but it might have different performance characteristics compared to `setPrototypeOf`.
3. **Measuring the performance of accessing properties directly on `simpleRef` without setting its prototype**: You can add a third test case to compare the performance of direct property access with and without modifying `simpleRef`'s prototype.

Keep in mind that these alternatives might require modifications to the benchmark script and might not be directly comparable to the original scenario.

Related benchmarks:

setPrototypeOf to Proxy3 (version: 0)

Comparing performance of: Setting prototype to proxy vs Temp

Created: 4 years ago by: Guest

Jump to the latest result

Setting prototype to proxy

Temp

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):