Benchmark: decorator vs jego brak

Script Preparation code:

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var ENABLED = true;
var MeasureFn = function (target, propertyKey, descriptor) {
    var originalMethod = descriptor.value;
    descriptor.value = function wrapped() {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        if (ENABLED) {
            window.performance.mark('ABC:activate');
        }
        var result = originalMethod.apply(this, args);
        if (ENABLED) {
            window.performance.measure('ABC', 'ABC:activate');
            window.performance.clearMarks('ABC:activate');
        }
        return result;
    };
    // return edited descriptor as opposed to overwriting the descriptor
    return descriptor;
};
var ABC = /** @class */ (function () {
    function ABC() {
    }
    ABC.prototype.register = function () {
    };
    __decorate([
        MeasureFn,
        __metadata("design:type", Function),
        __metadata("design:paramtypes", []),
        __metadata("design:returntype", void 0)
    ], ABC.prototype, "register", null);
    return ABC;
}());
var CBA = /** @class */ (function () {
    function CBA() {
    }
    CBA.prototype.register = function () {
        if (ENABLED) {
            window.performance.mark('CBA:activate');
        }
        if (ENABLED) {
            window.performance.measure('CBA', 'CBA:activate');
            window.performance.clearMarks('CBA:activate');
        }
    };
    return CBA;
}());
var abc = new ABC();
var cba = new CBA();

Tests:

if
cba.register();
decorator
abc.register()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if
decorator

Fastest: N/A

Slowest: N/A

Latest 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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing two approaches to measure the execution time of the `register` method in JavaScript classes. The first approach uses a decorator (a function that extends or modifies another function) to wrap the original method, while the second approach doesn't use any decorator.

**Decorator vs No Decorator**

The test case "decorator" measures the execution time of the `register` method wrapped with the `MeasureFn` decorator. The `MeasureFn` decorator is a custom implementation that uses the Web Performance API to measure the execution time of the decorated function.

Here's what happens:

1. When the `register` method is called, it triggers the `MeasureFn` decorator.
2. The decorator sets up a performance mark and measures the execution time of the original `register` method using the performance API.
3. After the measurement is complete, the decorator clears the performance marks.

The test case "if" is similar, but it doesn't use the decorator.

**Pros and Cons**

Using a decorator like `MeasureFn` has both advantages and disadvantages:

Advantages:

* It provides a simple way to measure the execution time of functions without modifying their original code.
* It can be easily reused across multiple functions or classes.

Disadvantages:

* It adds overhead due to the extra function calls and performance mark/set clearing operations.
* It may not work correctly for all scenarios (e.g., async functions, generators).

Not using a decorator at all has some pros:

Advantages:

* No added overhead due to the extra function calls.
* Can be more suitable for simple cases where only the execution time needs to be measured.

However, it also means that you need to manually set up and clear performance marks, which can be error-prone and tedious.

**Other Considerations**

Some other considerations when using performance APIs like Web Performance in JavaScript:

* It's essential to ensure that the performance mark and measure operations are properly synchronized and cleared to avoid incorrect results.
* The use of performance APIs can introduce additional latency and overhead due to the extra function calls and memory allocation.
* Some browsers may have different implementations or limitations for the performance API, which can affect its accuracy.

**Alternatives**

If you're looking for alternative ways to measure execution time in JavaScript without using a decorator like `MeasureFn`, here are some options:

1. **Benchmarking libraries**: There are several benchmarking libraries available, such as Benchmark.js, Microbenchmark, or js-benchmark, that provide simple and efficient ways to measure execution times.
2. **Async callbacks**: You can use async callbacks (e.g., callbacks with a `done` function) to manually measure the execution time of functions.
3. **Manual timing**: You can use the `Date.now()` function to manually measure the execution time of functions by recording the start and end times.

Keep in mind that each approach has its pros and cons, and the choice ultimately depends on your specific use case and requirements.

Related benchmarks:

decorator vs jego brak (version: 0)

Comparing performance of: if vs decorator

Created: 4 years ago by: Registered User

Jump to the latest result

if

decorator

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):