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6e8fbee3-9c41-432e-8606-5a5df016e2b0
(version: 0)
Comparing performance of:
Object.keys vs Object.getOwnPropertyNames
Created:
2 years ago
by:
Guest
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Script Preparation code:
var obj = { "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9, "10": 10, "11": 11, "12": 12, "13": 13, "14": 14, "15": 15, "16": 16, "17": 17, "18": 18, "19": 19, "20": 20, "21": 21, "22": 22, "23": 23, "24": 24, "25": 25, }
Tests:
Object.keys
Object.keys(obj);
Object.getOwnPropertyNames
Object.getOwnPropertyNames(obj)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Object.keys
Object.getOwnPropertyNames
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents two individual test cases: `Object.keys` and `Object.getOwnPropertyNames`. These test cases compare the performance of two similar methods in JavaScript. **What is being tested?** The main difference between these two test cases lies in the method used to iterate over the object's properties: * `Object.keys(obj)`: Returns an array of a given object's own enumerable property names. It iterates over the properties using a for...in loop, which returns both enumerable and non-enumerable properties. * `Object.getOwnPropertyNames(obj)`: Returns an array containing all own property (including non-enumerable ones). It also uses a for...in loop to iterate over the properties. **Options comparison** These two methods are often used interchangeably due to their similarities, but they have different use cases and implications: * **Performance**: `Object.getOwnPropertyNames` is generally slower than `Object.keys`, especially when dealing with large objects, because it includes non-enumerable properties. * **Precision**: If you need to access only enumerable properties, `Object.keys` might be a better choice. However, if you require access to both enumerable and non-enumerable properties, `Object.getOwnPropertyNames` is the way to go. * **Compatibility**: `Object.getOwnPropertyNames` was introduced in ECMAScript 5 (ES5), while `Object.keys` is part of ES2015 (also known as ES6). **Pros and Cons** * **Object.keys(obj)**: * Pros: Smaller footprint, faster execution (in general). * Cons: Does not include non-enumerable properties. * **Object.getOwnPropertyNames(obj)**: * Pros: Includes all own properties (both enumerable and non-enumerable). * Cons: Larger footprint, potentially slower execution. **Library usage** Neither of the two methods relies on external libraries. They are built-in JavaScript functions that work natively across most platforms. **Special JS features or syntax** There is no explicit mention of any special JavaScript features or syntax in these test cases. Both `Object.keys` and `Object.getOwnPropertyNames` utilize standard JavaScript functionality. **Alternatives** If you need more control over the iteration process or access to specific properties, consider using the following alternatives: * **For...in loop**: This is a traditional way of iterating over object properties but can include non-enumerable properties. * **For...of loop**: Introduced in ES2015 (ES6), this loop iterates only over enumerable properties and provides better performance compared to the for...in loop. Keep in mind that these alternatives may require more manual handling and processing, especially when dealing with large objects or complex data structures.
Related benchmarks:
using .length within and out of for loop
_.values vs Object.values with big object
6e8fbee3-9c41-432e-8606-5a5df016e2b1
keys vs entriess
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