Benchmark: Object.assign vs spread operator

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
jQuery extend
var params = { b:"hello", c: true, d:7 }; var other = $.extend({ a: 2 }, params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator
jQuery extend

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Description**

The benchmark is comparing three ways to merge objects in JavaScript:

1. `Object.assign()`
2. Spread operator (`...`)
3. jQuery's `$extend()` method (using jQuery library)

**Script Preparation Code**

There's no script preparation code provided, which means the benchmarks are likely using a default configuration.

**Html Preparation Code**

There's also no html preparation code provided, which suggests that the benchmarks don't require any specific HTML setup.

**Individual Test Cases**

The benchmark has three test cases:

1. `Object.assign()`: This test case uses the `Object.assign()` method to merge an object with another object.
2. Spread operator (`...`): This test case uses the spread operator to merge an object with another object.
3. jQuery extend (`$.extend()`): This test case uses jQuery's `$extend()` method to merge two objects.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

1. `Object.assign()`:
	* Pros: Widely supported, works with any type of object (not just arrays).
	* Cons: Can be slower due to the need to iterate over properties.
2. Spread operator (`...`):
	* Pros: Fast and concise way to merge objects, works well with modern browsers.
	* Cons: Only works with objects that have a `[[Prototype]]` property (most modern objects do, but older ones may not).
3. jQuery extend (`$.extend()`):
	* Pros: Works with any type of object, can be used in older browsers that don't support the spread operator or `Object.assign()`.
	* Cons: Requires jQuery library to be included, adds extra overhead due to the need for a library.

**Library and Its Purpose**

In this benchmark, the jQuery library is being used for its `$extend()` method. The purpose of the library is to provide a convenient way to merge objects in older browsers that don't support modern JavaScript features.

**Special JS Features or Syntax**

There's no special JS feature or syntax being tested here. The tests are focused on comparing different ways to merge objects.

**Other Alternatives**

If you're looking for alternatives to these methods, you might consider:

* Using the `merge` function from the Lodash library, which provides a similar interface to `$extend()`.
* Implementing your own merging function using JavaScript's built-in functions like `Object.keys()` and `forEach()`.
* Using a different library, such as Underscore.js or Moment.js, which provide their own merge functionality.

Keep in mind that these alternatives may have different performance characteristics, dependencies, and usage patterns compared to the methods being tested here.

Related benchmarks:

Object.assign vs spread operator (version: 0)

Comparing performance of: Object.assign vs spread operator vs jQuery extend

Created: 8 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

jQuery extend

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):