Benchmark: JavaScript spread operator vs Object.assign performanceerwrewrew

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.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):

LLMs can make mistakes. Check important info.

Let's break down what is being tested in the provided benchmark.

**Benchmark Definition:**
The benchmark is comparing the performance of two approaches to merge two objects into one:

1. Using the JavaScript spread operator (`...`).
2. Using the `Object.assign()` method.

**Options Compared:**

* Spread Operator (`...`)
	+ Pros:
		- Concise and expressive syntax.
		- No need to specify the target object.
	+ Cons:
		- May not be supported in older browsers or versions of JavaScript (e.g., older ES6 implementations).
		- Can lead to slower performance due to the creation of a new object and the overhead of iterating over the spreadable properties.
* `Object.assign()`
	+ Pros:
		- Wide browser support, including older versions.
		- Well-documented and widely used method for merging objects.
	+ Cons:
		- More verbose syntax compared to the spread operator.
		- Requires an explicit target object.

**Other Considerations:**

* The benchmark is running on a desktop device with Chrome 95 on Mac OS X 10.15.6, which provides a good starting point for testing performance.
* The benchmark is comparing the two approaches under the same execution conditions, allowing for a fair comparison of their relative performance.

**Library and Features Used:**

* `Object.assign()` uses the built-in JavaScript method to merge objects.
* No special features or syntax are being tested in this benchmark.

Now, let's take a look at other alternatives:

* **Other merge methods:** In addition to the spread operator and `Object.assign()`, other methods like `lodash.merge()` or custom functions could be used to merge objects. However, these would likely have different performance characteristics compared to the two approaches being tested.
* **Alternative targets:** The benchmark is targeting a single object (`finalObject`) as the result of the merge operation. Other alternatives might use multiple objects or arrays as input.

Other alternatives for creating and running JavaScript microbenchmarks include:

* Benchmarking libraries like Benchmark.js, Microbenchmark, or Fast benchmarks
* Frameworks like Jest or Mocha for building and running tests
* Online platforms like jsperf, jsbench, or other benchmarking tools specifically designed for JavaScript performance testing.

Related benchmarks:

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

Comparing performance of: Using the spread operator vs Using Object.assign

Created: 4 years ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.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):