Benchmark: Object.assign vs spread operator no jquery

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 };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36

Browser/OS: Chrome 87 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.assign	4606490.5 Ops/sec
spread operator	13369536.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore the provided benchmark.

**What is being tested?**

The benchmark compares two approaches to merge objects in JavaScript:

1. **`Object.assign()`**: A built-in method that takes an object as its first argument and returns a new object with the properties of the original object merged into it.
2. **Spread operator (`...`)**: A syntax feature introduced in ECMAScript 2018, which allows you to spread the properties of an object onto another object.

**Options being compared**

The benchmark compares these two approaches in terms of performance and efficiency.

**Pros and Cons:**

* **`Object.assign()`**:
	+ Pros:
		- Wide support across browsers and versions.
		- Easy to use and understand.
	+ Cons:
		- May have slower performance due to the creation of a new object.
		- Can be less efficient than the spread operator when dealing with large objects.
* **Spread operator (`...`)**:
	+ Pros:
		- Generally faster and more efficient than `Object.assign()`.
		- More concise and readable code.
	+ Cons:
		- Less supported across older browsers (pre-ES2018).
		- May not work as expected in certain scenarios due to the nuances of object merging.

**Library used**

None, this benchmark does not rely on any external libraries.

**Special JavaScript features or syntax**

The spread operator (`...`) is a new feature introduced in ECMAScript 2018. It allows you to spread the properties of an object onto another object using the syntax `objectName = { ... otherObject }`.

**Other alternatives**

If you're looking for alternative approaches, consider:

* **`Array.prototype.concat()`**: Although deprecated since ECMAScript 5, it can be used as a fallback when `Object.assign()` is not supported.
* **Manual object merging using `for...in` and assignment**: This approach requires more code and manual iteration but can be effective in certain scenarios.

Keep in mind that the spread operator has become a widely accepted and efficient way to merge objects in modern JavaScript. If you're targeting recent browsers, it's likely a good choice for this benchmark.

Related benchmarks:

Object.assign vs spread operator no jquery (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 4 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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