Benchmark: Spread v Assign 12/10

Tests:

Spread
const first = { data: 'Hello' } const second = { moreData: 'Hi' } const result = { ...first, ...second };
Assign
const first = { data: 'Hello' } const second = { moreData: 'Hi' } const result = Object.assign(first, second);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Assign

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark definition is provided in JSON format, which defines two test cases: "Spread" and "Assign". The script preparation code for each test case is empty, indicating that no specific setup or initialization code is required. This suggests that the focus is on comparing the performance of two different methods for merging objects.

**Test Cases**

There are only two test cases:

1. **Spread**: This test case uses the spread operator (`...`) to merge two objects: `first` and `second`. The resulting object, `result`, contains all properties from both original objects.
2. **Assign**: This test case uses the `Object.assign()` method to merge two objects: `first` and `second`. The resulting object, `result`, contains only the own enumerable properties of both original objects.

**Options Compared**

The benchmark is comparing two different approaches for merging objects:

1. **Spread Operator (`...`)**
2. **Object.assign()**

Both methods have their pros and cons:

* **Spread Operator (`...`)**:
	+ Pros:
		- More concise and readable
		- Works with non-object values (e.g., arrays, strings)
		- Supports nested objects
	+ Cons:
		- May lead to slower performance in some cases due to the overhead of creating new objects
		- Not supported in older browsers
* **Object.assign()**:
	+ Pros:
		- Well-supported across all modern browsers and Node.js versions
		- More predictable behavior for merging objects
	+ Cons:
		- Less concise and less readable compared to the spread operator
		- May not work as expected with non-object values (e.g., arrays, strings)

**Library and Special JS Features**

There is no specific library or special JavaScript feature being used in this benchmark. The focus is on comparing the performance of two fundamental methods for merging objects.

**Other Considerations**

It's worth noting that other methods for merging objects could also be tested, such as using `Object.create()` or implementing a custom merge function. However, the spread operator and `Object.assign()` are widely supported and commonly used approaches, making them a good starting point for benchmarking.

**Alternatives**

Other alternatives for merging objects include:

1. **`Object.merge()`**: A method not part of the standard JavaScript API but implemented in some libraries.
2. **Custom merge function**: Implementing a custom function to merge two objects based on specific criteria or requirements.
3. **Using `Array.prototype.reduce()` or `Array.prototype.concat()`**: For merging arrays or other collections, rather than individual objects.

These alternatives might be useful depending on the specific use case or requirements of your project.

Related benchmarks:

Spread v Assign 12/10 (version: 0)

Comparing performance of: Spread vs Assign

Created: 4 years ago by: Guest

Jump to the latest result

Spread

Assign

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):