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Reflect.ownKeys vs object.keys preformence
(version: 0)
Reflect.ownKeys vs object.keys preformence
Comparing performance of:
reflact vs objectKeys
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var dicr = {}; for (var i = 0; i < 1000; i++) { var key1= Math.floor(Math.random() * 1000); var key2= Math.floor(Math.random() * 1000); dicr[`${key1}_${key1}`] = key2; }
Tests:
reflact
for (var i = 0; i < 1000; i++) { const res = Reflect.ownKeys(dicr) }
objectKeys
for (var i = 0; i < 1000; i++) { const res = Object.keys(dicr) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
reflact
objectKeys
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
10 days ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.0
Browser/OS:
Firefox 150 on Mac OS X 10.15
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Test name
Executions per second
reflact
252.4 Ops/sec
objectKeys
446795.3 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into explaining the provided JSON benchmark and its options. **Benchmark Definition** The provided JSON defines two benchmarks: 1. `Reflect.ownKeys vs object.keys performance` 2. Two individual test cases: * `reflact` (using `Reflect.ownKeys`) * `objectKeys` (using `Object.keys`) **Options being compared** In this benchmark, the main difference between the two options is how they are used to retrieve keys from an object: 1. **`Reflect.ownKeys`**: This method returns a new array-like object containing only the own property names (i.e., excluding inherited properties) of the given object. 2. **`Object.keys`**: This method returns an array of a given object's own enumerable property names. **Pros and Cons** * **`Reflect.ownKeys`**: + Pros: Can be more efficient when dealing with large objects, as it only returns own properties, excluding inherited ones. Additionally, `Reflect.ownKeys` is a newer method introduced in ECMAScript 2015 (ES6), which might be optimized for performance. + Cons: May not work correctly in older browsers or versions of JavaScript that don't support the Reflect API. * **`Object.keys`**: + Pros: Widely supported across most modern browsers and JavaScript engines. It's also a more traditional method, making it easier to understand and implement. + Cons: Returns all own properties, including inherited ones, which might be slower for very large objects. **Library and purpose** There are no libraries explicitly mentioned in this benchmark. However, `Reflect` is a built-in JavaScript API that provides methods for reflecting on objects, such as `ownKeys`. **Special JS feature or syntax** This benchmark does not use any special JavaScript features or syntax beyond the ones mentioned above (e.g., `let`, `const`, `template literals`). If you're interested in exploring other advanced JavaScript features, I can provide explanations for those as well. **Other alternatives** If you'd like to test alternative methods for retrieving keys from an object, some options could be: 1. **`for...in` loop**: Iterates over all properties (own and inherited) of an object using a `for...in` loop. 2. **`JSON.keys()`**: An older method that returns an array of property names as a string (not recommended due to limitations). 3. **`Array.from()` with `Object.entries()`**: Can be used to create an array of own property names, but may not be as efficient or memory-friendly as `Reflect.ownKeys`. Keep in mind that these alternatives might have different performance characteristics and usage scenarios compared to the methods being tested here. I hope this explanation helps you understand the provided benchmark!
Related benchmarks:
Object.keys(obj)[0] vs for in
Object.keys vs Object.getOwnPropertyNames - objects with 0 keys
Object.keys(object).includes(key) vs key in object
key in object vs object.key
For in vs Object.entries 2
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