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Object Assignment vs DefineProperties
(version: 0)
Comparing performance of:
Object Assign vs DefineProperties Function
Created:
2 years ago
by:
Registered User
Go to the latest result
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>
Run tests (2)
Previous results
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Test case name
Result
Object Assign
DefineProperties Function
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
8 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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=621408" width="100%" height="500px"></iframe>
Object Assign
22.2M/s
DefineProperties Function
15K/s
View exact numbers
Test name
Executions per second
✓
Object Assign
22,242,230 Ops/sec
DefineProperties Function
15,389 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**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.
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