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 };

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

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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.

**Benchmark Description**
The benchmark is comparing the performance of two approaches: `Object.assign` and the spread operator (`...`). The goal is to determine which method is faster for creating a new object by merging two existing objects.

**Options Compared**

1. **Object.assign**: A built-in JavaScript function that merges all own enumerable properties of one or more source objects into a new object.
2. **Spread Operator (`...`)**: Introduced in ECMAScript 2015, the spread operator allows you to expand an array or an object by its elements.

**Pros and Cons**

1. `Object.assign`:
	* Pros:
		+ Wide browser support (even older versions of Internet Explorer)
		+ More readable code
	* Cons:
		+ Can be slower than the spread operator due to function call overhead
2. Spread Operator (`...`):
	* Pros:
		+ Faster execution time compared to `Object.assign`
		+ More concise and expressive code
	* Cons:
		+ Requires modern JavaScript features (ECMAScript 2015 or later)
		+ May not work in older browsers

**Library/Dependency**
There is no specific library being used in this benchmark. The comparison is between two native JavaScript features.

**Special JS Feature/Syntax**
The spread operator (`...`) requires support for ECMAScript 2015 syntax, which is a relatively new standard. This means that the test might not be compatible with older browsers or environments that don't support this feature.

**Other Alternatives**

1. **Array.prototype.push.apply()**: Another approach to merge objects, but less readable and more complex than using `Object.assign` or the spread operator.
2. **JSON.parse(JSON.stringify(obj))**: A method that can merge objects, but it's less efficient and might not work correctly for all types of data.

**Benchmark Preparation Code**
The provided JSON doesn't include any preparation code, which means the benchmark is likely designed to run with default configuration settings.

To prepare a test case like this, you would need to create an HTML file that includes a script tag with the benchmark definition and a button to trigger the execution. The script might also require some setup, such as initializing variables or loading dependencies, but these are not specified in the provided JSON.

Related benchmarks:

Object.assign vs spread operator ... (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 7 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

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):