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DefineProperties vs assignment
(version: 1)
Comparing performance of:
Define properties vs assignment
Created:
one year ago
by:
Guest
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Tests:
Define properties
for (var i=0; i<10000; i++) { const x = Object.defineProperties(Object.create(null), { ns: {value: "ns"}, tags: {value: Object.create(null)}}); }
assignment
for (var i=0; i<10000; i++) { const x = Object.create(null) x.ns = "ns" x.tags = Object.create(null); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Define properties
assignment
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/139.0.0.0 Safari/537.36 Edg/139.0.0.0
Browser/OS:
Chrome 139 on Windows
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<iframe src="https://measurethat.net/Embed?id=614959" width="100%" height="500px"></iframe>
assignment
4K/s
Define properties
453/s
View exact numbers
Test name
Executions per second
✓
assignment
3,960 Ops/sec
Define properties
453 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
The benchmark described compares the performance of two approaches for creating objects in JavaScript: using `Object.defineProperties` versus using direct assignment to define properties on an object. Here’s a breakdown of what is being tested, including the pros and cons of each approach and additional considerations. ### Approaches Compared 1. **Using `Object.defineProperties`:** - **Test Case Code:** ```javascript for (var i=0; i<10000; i++) { const x = Object.defineProperties(Object.create(null), { ns: { value: "ns" }, tags: { value: Object.create(null) } }); } ``` - **Description:** This approach involves using `Object.defineProperties`, which allows for the definition of property properties (like `enumerable`, `configurable`, and `writable` in addition to just the value). 2. **Direct Assignment:** - **Test Case Code:** ```javascript for (var i=0; i<10000; i++) { const x = Object.create(null); x.ns = "ns"; x.tags = Object.create(null); } ``` - **Description:** This method simply assigns properties directly to the object using the assignment syntax. ### Performance Results The benchmark results show significant differences in the execution speed of the two methods: - **Direct Assignment:** - Executions Per Second: **3286.20** - Faster and more efficient for this use case. - **Using `Object.defineProperties`:** - Executions Per Second: **411.03** - Much slower, but provides more control over property characteristics. ### Pros and Cons #### `Object.defineProperties` - **Pros:** - Allows detailed control over the property characteristics beyond just value. For instance, you can make a property non-writable or non-enumerable. - Useful for defining properties with specific behavior, which can be important in certain object-oriented designs. - **Cons:** - Slower in performance, as evidenced by the benchmark results. - More verbose and complex, which can lead to more boilerplate code. #### Direct Assignment - **Pros:** - Faster and more performant for simple property assignments. - Easier and more intuitive to read and write for straightforward property creation. - **Cons:** - Less control over the behavior of the properties (all properties will be writable and enumerable by default). ### Other Considerations - This benchmark highlights a common decision point developers face regarding performance versus flexibility. For scenarios requiring simple object creation with no special property behavior, direct assignment is preferable. - In contrast, if an application requires encapsulation of data and strict control over property attributes, `Object.defineProperties` could be warranted despite the performance hit. ### Alternatives - Other ways to manage properties and creation of objects in JavaScript include: - **Object literals:** Using curly braces for quick and simple object creation. - **Class syntax:** Defining classes with the `class` keyword to create blueprints for objects. - **Factory functions:** Using functions to create and return objects, providing flexibility and encapsulation. - **Proxy:** Using the Proxy object for more sophisticated control over property access and modification. In conclusion, the choice between using `Object.defineProperties` and direct assignment should be informed by the specific requirements of the application regarding performance and property control.
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