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Object defineProperty
(version: 0)
Benchmark.js
Comparing performance of:
defineProperty vs Raw access
Created:
10 years ago
by:
Guest
Go to the latest result
Tests:
defineProperty
var obj = {}; Object.defineProperty(obj, '$i', {enumerable:false, value:true});
Raw access
var obj = {}; obj.$i = true;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
defineProperty
Raw access
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
9 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser/OS:
Chrome 143 on Windows
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<iframe src="https://measurethat.net/Embed?id=622923" width="100%" height="500px"></iframe>
Raw access
251.8M/s
defineProperty
16.1M/s
View exact numbers
Test name
Executions per second
✓
Raw access
251,802,576 Ops/sec
defineProperty
16,064,327 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested, the options compared, pros and cons, and other considerations. **Benchmark Definition** The benchmark definition represents a piece of JavaScript code that creates an object with a property called `$i` using two different methods: 1. `Object.defineProperty(obj, '$i', { enumerable: false, value: true });` 2. `var obj = {}; obj.$i = true;` These two methods are compared to measure their performance. **Options Compared** The two options being compared are: 1. **Using `Object.defineProperty()`**: This method is a part of the JavaScript Object Model (JSOM) and allows you to define properties on an object in a more explicit and flexible way. 2. **Direct Property Assignment**: This method assigns a value directly to a property without using any additional functions or methods. **Pros and Cons** 1. **Using `Object.defineProperty()`**: * Pros: + More explicit and flexible way of defining properties. + Provides better control over property metadata (e.g., enumerability, writable, configurable). * Cons: + Can be slower due to the overhead of calling a function. 2. **Direct Property Assignment**: * Pros: + Faster and more lightweight. * Cons: + Less explicit and less flexible than `Object.defineProperty()`. + May lead to unexpected behavior if not used carefully. **Other Considerations** 1. **Library Usage**: Neither of the options uses any external libraries. However, it's worth noting that some browsers may have additional features or APIs that might affect performance. 2. **Special JS Features/Syntax**: There are no special JavaScript features or syntax being tested here. **Alternative Approaches** Other alternatives could include: 1. Using `Object.create()` instead of `var obj = {}`. 2. Using `Object.defineProperty()` with different metadata options (e.g., writable, configurable). 3. Comparing performance using a different property name or data type. 4. Adding additional operations before or after the property assignment to simulate real-world scenarios. Keep in mind that these alternatives would require modifications to the benchmark definition and may not be relevant to this specific test case.
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Object.assign vs defineProperties vs setPrototypeOf vs extends Function vs defineProperty
defineProperty descriptor configurable
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