Benchmark: defineProperty enum vs nonenum

Script Preparation code:

    var DefineProperty = /** @class */ (function () {
        function DefineProperty() {
            Object.defineProperty(this, "b", {
                enumerable: true,
                configurable: true,
                writable: true,
                value: 2
            });
        }
        return DefineProperty;
    }());
    var DefinePropertyNE = /** @class */ (function () {
        function DefineProperty() {
            Object.defineProperty(this, "b", {
                enumerable: false,
                configurable: true,
                writable: true,
                value: 2
            });
        }
        return DefineProperty;
    }());
    var RawAccess = /** @class */ (function () {
        function RawAccess() {
            this.b = 2;
        }
        return RawAccess;
    }());

Tests:

defineProperty
var obj = new DefineProperty();
Raw access
var obj = new RawAccess()
defineProperty ne
var obj = new DefinePropertyNE();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
defineProperty
Raw access
defineProperty ne

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing three approaches to access an enum value:

1. `defineProperty`: This approach uses the `Object.defineProperty` method to define a property on an object, which is then accessed as if it were an enum value.
2. `RawAccess`: This approach directly accesses the enum value without using any special methods or syntax.

**Options Compared**

The benchmark is comparing these two approaches:

* `defineProperty`: uses `Object.defineProperty` to define a property
* `RawAccess`: directly accesses the enum value

**Pros and Cons**

1. **defineProperty**:
	* Pros: This approach provides a more explicit way of defining properties on an object, which can be useful for certain use cases (e.g., when working with older browsers that don't support enums).
	* Cons: It adds overhead due to the `Object.defineProperty` method, which may impact performance.
2. **RawAccess**:
	* Pros: This approach is simpler and doesn't add any overhead since it doesn't involve a special method or syntax.
	* Cons: It relies on the fact that the enum value is directly accessible without any additional processing.

**Other Considerations**

The benchmark also considers two variations of `defineProperty`:

1. `defineProperty ne`: This approach uses `Object.defineProperty` with the same configuration as `RawAccess`, but still defines a property.
2. `defineProperty enum`: This approach uses `Object.defineProperty` with additional configurations to mimic the behavior of enums (e.g., setting the `enumerable` property to `false`).

These variations are likely included to ensure that the benchmark accurately captures the performance differences between these approaches.

**Library**

The `RawAccess` class is using a custom implementation, but it's worth noting that this approach relies on the fact that enum values can be directly accessed without any additional processing. In modern JavaScript engines, this is not necessarily true, and other approaches might be more suitable for certain use cases.

**Special JS Feature or Syntax**

There is no explicit mention of special JavaScript features or syntax in the benchmark definition. However, it's worth noting that the `Object.defineProperty` method has been available since ECMAScript 5 (ES5), which was standardized in 2009.

**Alternatives**

Other alternatives for accessing enum values might include:

1. Using a custom class or mixin to encapsulate the enum value.
2. Utilizing libraries like Lodash or Underscore.js, which provide utility functions for working with enums.
3. Implementing a bespoke solution using native code (e.g., C++ or assembly) if performance is critical.

In summary, the benchmark tests the performance difference between accessing an enum value using `defineProperty` and `RawAccess`. The `defineProperty ne` variation is included to ensure accurate results for this specific scenario.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser/OS: Chrome 93 on Windows

View result in a separate tab

Test name	Executions per second
defineProperty	2346076.2 Ops/sec
Raw access	13245882.0 Ops/sec
defineProperty ne	2165543.2 Ops/sec

Related benchmarks:

defineProperty enum vs nonenum (version: 0)

Comparing performance of: defineProperty vs Raw access vs defineProperty ne

Created: 3 years ago by: Guest

Jump to the latest result

defineProperty

Raw access

defineProperty ne

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):