Benchmark: Test checking of literal object types

Script Preparation code:

var cls = function() {},
    constructorObject = function(a) {
        return (!!a) && (a.constructor === Object);
    },
    prototypeObject = function(a) {
        return Object.getPrototypeOf(a) === Object.prototype;
    };

var obj = {};

Tests:

prototype
prototypeObject(obj); prototypeObject(new cls);
constructor
constructorObject(obj); constructorObject(new cls);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
prototype
constructor

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
prototype	22934686.0 Ops/sec
constructor	74046816.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in this JavaScript microbenchmark.

**Benchmark Overview**

The benchmark is designed to measure the performance difference between two approaches: constructor-based object creation and prototype-based object creation in JavaScript.

**Test Cases**

There are two test cases:

1. **prototype**: This test case checks if an object has the `prototype` property and its value is an instance of `Object.prototype`.
2. **constructor**: This test case checks if a class (defined using the `function` keyword) has a constructor function that returns `true` when passed a valid object.

**Library Usage**

The benchmark uses the `Object.getPrototypeOf()` method, which is a standard JavaScript method for getting the prototype of an object. The `Object.prototype` property is also used in the test cases.

**Special JS Feature/Syntax**

There's no special JS feature or syntax mentioned in this benchmark. It only relies on standard JavaScript functionality.

**Options Compared**

The benchmark compares two options:

1. **Constructor-based Object Creation**: This approach creates objects using a class definition with a constructor function. The `constructor` method is called to create a new object instance.
2. **Prototype-based Object Creation**: This approach creates objects by setting the `prototype` property of an object to another object, effectively creating a prototype chain.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Constructor-based Object Creation**
	* Pros:
		+ Easier to implement and understand for beginners
		+ Can be more efficient due to direct access to the constructor function
	* Cons:
		+ More verbose code compared to prototype-based creation
2. **Prototype-based Object Creation**
	* Pros:
		+ More concise and expressive code
		+ Can lead to more flexible and reusable code
	* Cons:
		+ Can be less efficient due to indirect access to the constructor function through `Object.getPrototypeOf()`

**Other Alternatives**

Other alternatives for creating objects in JavaScript include:

1. **Using a factory function**: Instead of using classes, you can define a factory function that returns an object instance.
2. **Using a class-like syntax**: Some modern browsers support class-like syntax (e.g., `class MyClass { constructor() {} }`) which allows for more concise object creation.

In conclusion, the benchmark is testing the performance difference between two approaches to creating objects in JavaScript: constructor-based and prototype-based object creation. The results can help users understand the trade-offs between these approaches and make informed decisions about their own code organization and performance optimization strategies.

Related benchmarks:

Test checking of literal object types (version: 0)

Comparing performance of: prototype vs constructor

Created: 3 years ago by: Guest

Jump to the latest result

prototype

constructor

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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