Benchmark: obj assign setproto create

Script Preparation code:

(function(){
  function _base() {
    return {
      a:111,b:1,c:'2134124141',
      d:'werrqwer',e:'34234',fffffffff:'324234',
      gggggg:'99999',jadf:'adsfa',asdfasdf:'asdf',asdfasdf:'sadf',
      [Math.random()]:Math.random(),
      [Math.random()]:Math.random()
    }
  }

  
(function(){
	const base = _base()
	window.assign = function(x){
		return Object.assign({[Math.random()+'x']:Math.random()+'x'+x},base)
  	}
})();

(function(){
	const base = _base()
	window.setproto = function(x){
        const z = Object.setPrototypeOf({
          [Math.random()+'x']: Math.random()+'x'+x
        },base)
		return z
	}
})();
  
  (function(){
	const base = _base()
	window.proto = function(x){
        const z = {
          [Math.random()+'x']: Math.random()+'x'+x
        }
        z.__proto__ = base
		return z
	}
})();
  
 
  (function(){
	const base = _base()
	window.create = function(x){
        const p = Object.create(base)
        p[Math.random()+'x'] = Math.random()+'x'+x
		return z
	}
})();
  
 (function(){
	const base = _base()
	window.factory = function(x){
        const o = _base()
        o[Math.random()+'x'] = Math.random()+'x'+x
		return o
	}
})();

})()

Tests:

assign
var red = assign('xx');
setproto
var yellow = setproto('yy');
proto
var z = proto('z');
create
var a = create('a');
factory
var b = factory('b')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
assign
setproto
proto
create
factory

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its results.

**Benchmark Definition**

The benchmark is designed to test different JavaScript assignment operators: `assign`, `setproto`, `proto`, `create`, and `factory`. These methods are used to assign values to objects, but they have subtle differences in how they work.

*   **`assign`**: This method uses the built-in `Object.assign()` function to copy properties from an object. It's a simple way to merge two objects.
*   **`setproto`**: This method sets the prototype of an object using `Object.setPrototypeOf()`. The prototype is the "parent" object that determines the inheritance chain for a given object. In this case, it sets the base object as the prototype of another object.
*   **`proto`**: This method creates a new object with the specified prototype set to the given object. It's similar to `setproto`, but uses `Object.create()` instead.
*   **`create`**: This method creates a new object using `Object.create()`. The result is an object that shares the same prototype as the base object, inheriting its properties and methods.
*   **`factory`**: This method returns a new object created from the given base object. It's similar to `create`, but doesn't set the prototype explicitly.

**Comparison of Options**

| Option | Description |
| --- | --- |
| `assign` | Simple assignment, uses built-in function. |
| `setproto` | Sets the prototype, may have performance implications due to changes in inheritance. |
| `proto` | Creates a new object with specified prototype, similar to `setproto`. |
| `create` | Creates a new object sharing same prototype as base object, suitable for inheritance scenarios. |
| `factory` | Returns a new object from the given base object, similar to `create`. |

**Pros and Cons**

*   **`assign`**: Simple and efficient, but might not be suitable when working with large datasets or inheritance chains.
*   **`setproto`**: Efficient for small objects, but can have performance implications due to changes in inheritance. It's better suited for scenarios where the prototype is explicitly controlled.
*   **`proto`**: Similar to `setproto`, but uses `Object.create()`. This approach might be more predictable and efficient than using `setproto`.
*   **`create`**: Suitable for inheritance scenarios, as it creates a new object sharing the same prototype. However, this can lead to unexpected behavior if not used carefully.
*   **`factory`**: Similar to `create`, but returns a new object without changing its prototype.

**Library and Special JS Features**

The benchmark uses the following libraries:

*   None explicitly mentioned in the provided code snippet.
*   No special JavaScript features are used, such as async/await or promises.

**Other Alternatives**

If you're looking for alternatives to this benchmark, consider the following:

1.  **Benchmarking frameworks**: Tools like Benchmark.js or microbenchmark provide a more comprehensive approach to testing performance differences between functions.
2.  **Inheritance and object creation libraries**: Libraries like Lodash's `cloneDeep` or `extend` can be used to test object creation and inheritance scenarios in a more controlled environment.
3.  **JavaScript engines with built-in assignment operators**: Some JavaScript engines, such as V8 (used by Google Chrome), have optimized built-in assignment operators that might outperform custom implementations.

By using these alternatives, you can create more comprehensive benchmarks and test cases to evaluate the performance of different JavaScript assignment operators in various scenarios.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser/OS: Chrome 75 on Windows 7

View result in a separate tab

Test name	Executions per second
assign	80802.9 Ops/sec
setproto	247022.8 Ops/sec
proto	220982.8 Ops/sec
create	0.0 Ops/sec
factory	121293.9 Ops/sec

Related benchmarks:

obj assign setproto create (version: 0)

Comparing performance of: assign vs setproto vs proto vs create vs factory

Created: 6 years ago by: Guest

Jump to the latest result

assign

setproto

proto

create

factory

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):