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$.extend() vs Object.assign()
(version: 0)
Benchmark.js
Comparing performance of:
$.extend() vs Object.assign()
Created:
6 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<script type="text/javascript" src="https://code.jquery.com/jquery-3.4.1.min.js"></script> <div id="testThisId"></div>
Tests:
$.extend()
var target = { a: 1, b: 2 }; var source = { b: 4, c: 5 }; var returnedTarget = $.extend(target, source);
Object.assign()
var target = { a: 1, b: 2 }; var source = { b: 4, c: 5 }; var returnedTarget = Object.assign(target, source);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
$.extend()
Object.assign()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Browser/OS:
Chrome 130 on Windows
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Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=568682" width="100%" height="500px"></iframe>
Object.assign()
6.4M/s
$.extend()
5.5M/s
View exact numbers
Test name
Executions per second
✓
Object.assign()
6,401,653 Ops/sec
$.extend()
5,521,735 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **What is being tested?** MeasureThat.net is testing two different methods for merging objects: `$.extend()` and `Object.assign()`. The benchmark is designed to compare the performance of these two approaches. **Options compared:** * `$.extend()`: a method provided by jQuery that merges one or more source objects into an existing target object. * `Object.assign()`: a built-in JavaScript method that merges all enumerable own properties of one or more source objects into an existing target object. **Pros and Cons:** * **$.extend():** + Pros: - Easy to use, especially for those familiar with jQuery. - Can be used to merge multiple objects at once using the `$.extend()` method's array syntax. + Cons: - Requires jQuery to be loaded, which can increase page load times and add unnecessary dependencies. - May have performance issues if not optimized properly (e.g., using a loop instead of a recursive function). * **Object.assign():** + Pros: - Built-in method, so no additional library is required. - Fast and efficient, as it uses the `V8` JavaScript engine's built-in property merging algorithm. + Cons: - May require more effort to use correctly, especially for those not familiar with its usage. **Library and purpose:** * `$.extend()`: a method provided by jQuery (a popular JavaScript library for DOM manipulation and event handling). Its primary purpose is to simplify the process of merging objects by providing a convenient way to merge multiple sources into an existing target object. * `Object.assign()`: a built-in JavaScript method that was introduced in ECMAScript 2015. It's designed to provide a simple and efficient way to merge properties from one or more source objects into an existing target object. **Special JS feature or syntax:** None mentioned in the provided benchmark, but it's worth noting that `Object.assign()` uses a feature called "call" (in older browsers) or "es6" method call (in modern browsers) which allows for more flexible function calls. The "call" method is used by `Object.assign()` to merge properties from source objects into the target object. **Other alternatives:** If you need to merge objects in JavaScript, there are a few other alternatives: * **Loose equal operator (`===`)**: You can use `obj1 === obj2` to check if two objects are equal. However, this method does not create a new merged object; it simply checks if the objects have the same value. * **`for...in` loop**: You can use a `for...in` loop to iterate over an object's properties and merge them into another object using `obj2[prop] = obj1[prop];`. * **ES6 spread operator (`{ ... }`)**: In modern JavaScript environments, you can use the spread operator `{ ... }` to create a new merged object from multiple source objects: `const mergedObj = { ...obj1, ...obj2 };`. Keep in mind that these alternatives may have different performance characteristics and usage patterns compared to `$.extend()` and `Object.assign()`.
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