Benchmark: spread operator vs Object.assign

Script Preparation code:

var firstObject = { 
  sampleData_1: 'Hello world_1',
  sampleData_2: 'Hello world_2',
  sampleData_3: 'Hello world_3',
  sampleData_4: 'Hello world_4',
  sampleData_5: 'Hello world_5',
  sampleData_6: 'Hello world_6',
  sampleData_7: 'Hello world_7',
}
var secondObject = { 
  moreData_1: 'foo bar 1',
  moreData_2: 'foo bar 2',
  moreData_3: 'foo bar 3',
  moreData_4: 'foo bar 4',
  moreData_5: 'foo bar 5',
  moreData_6: 'foo bar 6',
  moreData_7: 'foo bar 7',
}

Tests:

Using the spread operator
const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
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:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two ways to merge two objects in JavaScript: using the spread operator (`...`) and `Object.assign()`.

**Script Preparation Code**

The script preparation code defines two objects, `firstObject` and `secondObject`, which contain sample data. These objects are used as input for the benchmark.

**Html Preparation Code**

There is no HTML preparation code provided, so we can assume that this benchmark focuses solely on JavaScript performance.

**Individual Test Cases**

There are two test cases:

1. **Using the spread operator**: This test case uses the spread operator (`...`) to merge `firstObject` and `secondObject`. The syntax looks like this: `const finalObject = {...firstObject, ...secondObject};`
2. **Using Object.assign()**: This test case uses the `Object.assign()` method to merge `firstObject` and `secondObject`. The syntax looks like this: `const finalObject = Object.assign(firstObject, secondObject);`

**Pros and Cons of Each Approach**

1. **Using the spread operator**:
	* Pros:
		+ More concise and readable syntax
		+ Can be more efficient than `Object.assign()` for simple object merges
	* Cons:
		+ May not work as expected with certain types of objects or data structures (e.g., arrays)
2. **Using Object.assign()**:
	* Pros:
		+ More widely supported and compatible across different browsers and environments
		+ Can be used to merge multiple objects in a single call
	* Cons:
		+ May require more code and setup than the spread operator syntax

**Library and Syntax**

There is no library or special JavaScript feature being used in this benchmark. The tests rely on built-in JavaScript features like the spread operator and `Object.assign()`.

**Other Considerations**

When writing performance benchmarks, it's essential to consider factors like:

* Sample size and variability
* System configuration and hardware
* Browser version and compatibility
* Data distribution and representation

In this case, the benchmark uses a small sample of data and assumes a consistent system configuration. However, in real-world scenarios, you may need to consider more complex factors to ensure accurate results.

**Alternatives**

If you want to explore alternative approaches or variations on this benchmark, here are some ideas:

* Compare other object merge methods, like `Object.merge()` (not a standard method) or using `JSON.parse(JSON.stringify())`
* Use different types of data structures, such as arrays instead of objects
* Experiment with varying levels of data complexity and size
* Test the performance of these methods in more extreme environments, like mobile devices or older browsers

Related benchmarks:

spread operator vs Object.assign (version: 0)

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

Created: 3 years ago by: Registered User

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):