Benchmark: Spread operator vs twice Object.assign

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator
Object.assign 2

Fastest: N/A

Slowest: N/A

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

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Let's dive into the provided benchmarking data.

**Benchmark Description**

The benchmark is designed to compare the performance of two approaches: using the spread operator (`...`) and `Object.assign()` to merge an object with another object.

**Options Compared**

The benchmark tests three variations:

1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new object by copying properties from `params` into the existing object `{ a: 2 }`.
2. **`Object.assign()`**: This approach uses the `Object.assign()` method to merge the two objects.
3. **`Object.assign()` (again)**: This is another variation of using `Object.assign()`, likely intended for comparison with the first variant.

**Pros and Cons**

* **Spread Operator (`...`)**:
	+ Pros:
		- More concise and expressive syntax.
		- Can be more readable, especially when merging multiple objects.
	+ Cons:
		- May incur additional overhead due to the spread operator's complexity (more operations required).
		- Not supported in older browsers or environments.
* **`Object.assign()`**:
	+ Pros:
		- More widely supported across browsers and environments.
		- Can be optimized by browser engines, potentially leading to better performance.
	+ Cons:
		- May require more boilerplate code for merging objects.

**Library Usage**

None of the benchmarking tests explicitly use any external libraries. However, it's worth noting that `Object.assign()` is a built-in method in modern JavaScript environments.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark. The focus is on comparing two simple approaches to object merging.

**Other Alternatives**

If you were to modify this benchmark or create an alternative, you might consider other approaches, such as:

* Using `Object.create()` or a similar method to create a new object.
* Utilizing modern JavaScript features like Rest parameters (`...`) with `Object.assign()`.
* Implementing custom merging logic using recursion or iteration.

These alternatives would require changes to the benchmark definition and test cases.

Related benchmarks:

Spread operator vs twice Object.assign (version: 0)

Comparing performance of: Object.assign vs spread operator vs Object.assign 2

Created: 6 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

Object.assign 2

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):