Benchmark: Object.assign vs =

Tests:

Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } Object.assign(firstObject, secondObject);
Using =
const firstObject = { sampleData: 'Hello world' } firstObject.moreData = 'foo bar';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using Object.assign
Using =

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 its options.

**Benchmark Overview**

The benchmark is comparing two ways to merge objects in JavaScript: using `Object.assign()` and using the assignment operator (`=`). The test case consists of two scenarios:

1. Merging two separate objects into one, where `Object.assign()` is used.
2. Directly assigning properties from one object to another.

**Options Being Compared**

The two options being compared are:

1. **Using `Object.assign()`**: This method takes advantage of the spread operator (`...`) in modern JavaScript. It allows you to merge two or more objects into a new object, preserving the original structure and values.
2. **Using the assignment operator (`=`)**: This approach directly assigns properties from one object to another. However, this can lead to issues when working with nested objects or arrays.

**Pros and Cons of Each Approach**

1. **Using `Object.assign()`**:
	* Pros:
		+ Preserves the original structure and values.
		+ Can handle nested objects and arrays.
		+ Is generally more efficient than using the assignment operator.
	* Cons:
		+ Requires JavaScript version 7 or higher, as older versions of Internet Explorer did not support this method.
2. **Using the assignment operator (`=`)**:
	* Pros:
		+ Simpler syntax.
	* Cons:
		+ Can lead to issues with nested objects and arrays.
		+ May modify the original object unintentionally.

**Library/Feature Usage**

There is no specific library or feature being tested in this benchmark. However, it's worth noting that the use of `Object.assign()` relies on modern JavaScript features and spread operators, which have become widely supported across browsers and versions.

**Special JS Feature/Syntax**

This benchmark does not explicitly test any special JavaScript features or syntax. However, as mentioned earlier, it relies on modern JavaScript features like the spread operator (`...`).

**Alternatives**

If you were to implement this benchmark yourself, here are some alternatives:

1. **Using a loop**: Instead of using `Object.assign()` or the assignment operator, you could use a loop to iterate over properties and assign them manually.
2. **Using a library like Lodash**: Lodash provides an `assignIn` method that can be used for merging objects in a more robust and efficient way.
3. **Testing with other merge methods**: You could also test using other methods, such as `JSON.parse()` and `JSON.stringify()`, or libraries like jQuery's `extend()`.

Keep in mind that these alternatives may not provide the exact same results or comparisons as the original benchmark.

Related benchmarks:

Object.assign vs = (version: 0)

Comparing performance of: Using Object.assign vs Using =

Created: 3 years ago by: Guest

Jump to the latest result

Using Object.assign

Using =

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):