Benchmark: Object Assignment vs DefineProperties

Tests:

Object Assign
let n = 100; while (n--) { const obj = { a: function() { return 0; }, b: function() { return this.a(); }, c: 15, d: 'string', e: function(n) { return this.c + n; }, f: function(n) { this.c += n; } }; }
DefineProperties Function
let n = 100; while (n--) { const obj2 = {}; Object.defineProperties(obj2, { a: { value: function() { return 0; } }, b: { value: function() { return this.a(); }}, c: { value: 15, writable: false }, d: { value: 'string' }, e: { value: function(n) { return this.c + n; } }, f: { value: function(n) { this.c += n; }} }) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object Assign
DefineProperties Function

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object Assign	22242230.0 Ops/sec
DefineProperties Function	15388.6 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided JSON represents two test cases for measuring the performance of object assignment in JavaScript.

**Options being compared:**

1. **Object Assignment**: This approach creates an object with properties and assigns values to them directly.
2. **DefineProperties**: This approach uses the `Object.defineProperties()` method to define a set of properties on an existing object, including their initial values and access modifiers (e.g., writable).

**Pros and Cons:**

* **Object Assignment**:
	+ Pros: Easy to understand and implement, simple syntax.
	+ Cons: May not be as efficient or flexible as DefineProperties, especially for large objects or complex properties.
* **DefineProperties**:
	+ Pros: More efficient and flexible than object assignment, allows for fine-grained control over property behavior (e.g., writable, enumerable).
	+ Cons: Requires more code and understanding of the `Object.defineProperties()` method.

**Libraries and Special Features**

There are no libraries explicitly mentioned in the benchmark definition. However, it's likely that the `Object` class is used throughout both test cases.

**Special JavaScript Feature or Syntax**

None are explicitly mentioned in the benchmark definition.

**Other Considerations**

When choosing between object assignment and DefineProperties, consider the following:

* **Performance**: If you need to create a large number of objects with similar properties, DefineProperties might be more efficient.
* **Readability**: Object assignment is generally easier to understand and read, especially for simple cases.
* **Flexibility**: If you need fine-grained control over property behavior or want to take advantage of advanced features like computed property names or getters/setters, DefineProperties might be a better choice.

**Alternatives**

Other alternatives for creating objects in JavaScript include:

1. **Object.create()**: Creates an object with the specified prototype chain.
2. **Object.assign()**: Copies properties from one or more source objects to a target object.
3. **new Object()**: Creates a new, empty object instance.

Keep in mind that each of these alternatives has its own trade-offs and use cases, which may not be relevant to this specific benchmark comparison.

Related benchmarks:

Object Assignment vs DefineProperties (version: 0)

Comparing performance of: Object Assign vs DefineProperties Function

Created: 2 years ago by: Registered User

Jump to the latest result

Object Assign

DefineProperties Function

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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