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Object.assign() vs Reflect.set()
(version: 0)
Comparing performance of:
Object.assign() vs Reflect.set()
Created:
5 years ago
by:
Guest
Go to the latest result
Tests:
Object.assign()
const obj = {}; Object.assign(obj, {a: {b: 123}});
Reflect.set()
const obj = {}; Reflect.set(obj, 'a', {b: 123});
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Object.assign()
Reflect.set()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 131 on Android
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<iframe src="https://measurethat.net/Embed?id=570324" width="100%" height="500px"></iframe>
Object.assign()
2.7M/s
Reflect.set()
1.7M/s
View exact numbers
Test name
Executions per second
✓
Object.assign()
2,716,035 Ops/sec
Reflect.set()
1,659,460 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark. **What is being tested?** The benchmark compares the performance of two approaches: `Object.assign()` and `Reflect.set()`. Both methods are used to update the properties of an object in JavaScript. **Options compared** Two options are being compared: 1. **`Object.assign()`**: This method takes one or more source objects and merges them into a target object. 2. **`Reflect.set()`**: This is a static method on the `Reflect` object that sets the value of a property directly on an object. **Pros and cons** * **`Object.assign()`**: + Pros: widely supported, easy to use, can be used with multiple sources in a single call. + Cons: may incur overhead due to the creation of a new array when using multiple sources. * **`Reflect.set()`**: + Pros: provides more control over property updates, does not create a new array. + Cons: not as widely supported (only available since ECMAScript 2018), requires importing the `Reflect` object. **Other considerations** When choosing between these two methods, consider the following: * If you need to update multiple properties at once and don't mind creating a new array, `Object.assign()` might be sufficient. * If you need more control over individual property updates or want to avoid creating a new array, `Reflect.set()` is a better choice. **Library** There are no libraries mentioned in the benchmark definition. However, note that some older browsers may not support `Reflect.set()`, so it's always a good idea to include fallbacks or polyfills when using this method. **Special JS feature/syntax** No special JavaScript features or syntax are being used in this benchmark. **Benchmark preparation code and HTML Preparation Code** The benchmark definition only provides script preparation code (`Object.assign()` vs `Reflect.set()`) and no HTML preparation code is specified. This suggests that the benchmark is focused solely on measuring the performance of these two methods. **Other alternatives** If you need to measure other approaches for updating object properties, some alternatives include: * Using the ` bracket notation` (e.g., `obj['a'] = {b: 123}`) or the ` in-operator` (e.g., `if ('a' in obj) { obj.a = {b: 123}; }`) * Using a library like Lodash's `setIn()` function * Using a library like Immutable.js for immutable objects However, without more information about your specific use case, it's difficult to recommend the best alternative approach.
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