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getOwnPropertyDescriptors vs getOwnPropertyNames
(version: 0)
Comparing performance of:
getOwnPropertyNames vs getOwnPropertyDescriptors
Created:
3 years ago
by:
Registered User
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Tests:
getOwnPropertyNames
function objectProperties(object, result = {}) { let proto = object; while ((proto = Object.getPrototypeOf(proto)) !== Object.prototype) { for(const name of Object.getOwnPropertyNames(proto)) { result[name] = name; } } return result; } objectProperties(new MediaSource());
getOwnPropertyDescriptors
function objectProperties(object, result = {}) { let proto = object; while ((proto = Object.getPrototypeOf(proto)) !== Object.prototype) { for(const descriptor in Object.getOwnPropertyDescriptors(proto)) { result[descriptor] = descriptor; } } return result; } objectProperties(new MediaSource());
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
getOwnPropertyNames
getOwnPropertyDescriptors
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! The provided JSON represents a benchmark test for two approaches to retrieving property names and descriptors from an object: `getOwnPropertyNames` and `getOwnPropertyDescriptors`. **What is being tested?** These tests compare the performance of two methods: 1. `getOwnPropertyNames`: This method returns an array of strings representing the names of properties defined directly on the given object. It does not include inherited properties. 2. `getOwnPropertyDescriptors`: This method returns an object containing the descriptors of all properties defined directly and indirectly on the given object. **Options compared** The two options being compared are: 1. **`Object.getOwnPropertyNames()`**: Returns an array of strings representing the names of properties defined directly on the object. 2. **`Object.getOwnPropertyDescriptors()`**: Returns an object containing the descriptors of all properties defined directly and indirectly on the object. **Pros and Cons:** * `getOwnPropertyNames()`: Pros: + Faster, as it only iterates over the object's own properties. + Less memory-intensive, as it doesn't store property descriptors. * Cons: + Does not include inherited properties in its results. + May not be suitable for objects with a large number of properties or complex inheritance hierarchies. * `getOwnPropertyDescriptors()`: Pros: + Includes all properties, including inherited ones. + Can provide more information about each property (e.g., value type, accessibility). * Cons: + Slower, as it needs to access the object's prototype chain and iterate over its properties. + More memory-intensive, as it stores property descriptors. **Library: None** There are no external libraries used in these tests. The `Object` object is a built-in JavaScript object that provides various methods for manipulating objects, including the two options being compared. **Special JS feature or syntax:** None The tests use only standard JavaScript features and syntax. **Benchmark preparation code** The provided benchmark preparation code defines a simple function `objectProperties` that takes an object and returns a result object containing property names. The function uses `Object.getPrototypeOf` to traverse the object's prototype chain and iterates over its properties using `Object.getOwnPropertyNames` (or `Object.getOwnPropertyDescriptors`) to retrieve their names. **Individual test cases** There are two individual test cases: 1. **`getOwnPropertyNames`**: This test case runs the `objectProperties` function with a new instance of `MediaSource` object, passing `Object.getOwnPropertyNames` as the method to use. 2. **`getOwnPropertyDescriptors`**: This test case is similar to the first one, but uses `Object.getOwnPropertyDescriptors` instead. **Latest benchmark result** The provided JSON contains two execution results: 1. The first result shows a faster execution time for `getOwnPropertyNames`, with 183718 executions per second. 2. The second result shows a slower execution time for `getOwnPropertyDescriptors`, with 90338 executions per second. **Alternatives** Other alternatives for retrieving property names and descriptors include: * Using `Reflect.ownKeys()` or `Object.keys()` to get an array of property names, which may be more efficient than using `Object.getOwnPropertyNames()`. * Using `Object.entries()` to get an array of key-value pairs, where each pair contains the name and descriptor of a property. * Implementing custom methods using iterators or other advanced JavaScript features.
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