Benchmark: 012942 - MeasureThat.net

Tests:

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

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 break down what's being tested in this benchmark.

**Benchmark Definition**: The provided JSON defines two benchmarks, which are essentially identical JavaScript code snippets that demonstrate different ways of merging objects.

The first benchmark uses the spread operator (`...`) to merge an object. It creates a new object `finalObject` by copying all properties from `firstObject` and adding a new property `moreData`.

```javascript
const finalObject = { ...firstObject, moreData: 'foo bar' };
```

The second benchmark uses the `Object.assign()` method to achieve the same result:

```javascript
const finalObject = Object.assign(firstObject, { moreData: 'foo bar' });
```

**Options Compared**: The two benchmarks are comparing the performance of these two different approaches to merge objects.

**Pros and Cons of Each Approach**

1. **Spread Operator (`...`)**:
	* Pros:
		+ More concise and readable.
		+ Less prone to errors, as it's a more explicit way of merging objects.
	* Cons:
		+ May have performance overhead due to the creation of a new object.
2. **Object.assign()**:
	* Pros:
		+ Faster and more efficient than the spread operator, as it uses native methods under the hood.
	* Cons:
		+ Less readable and less explicit about the intention of merging objects.

**Library/Functionality Used**: None mentioned in the provided JSON.

**Special JS Feature/Syntax**: The use of the spread operator (`...`) is a relatively recent feature introduced in ECMAScript 2018 (ES2018). It allows for more concise way of creating new objects by spreading properties from existing objects.

**Other Alternatives**: There are other ways to merge objects, such as using `Array.prototype.concat()` or `JSON.parse(JSON.stringify())`, but they may not be as efficient or readable as the two approaches compared here. For example:

* **Array.prototype.concat()**: Not recommended for merging objects, as it concatenates arrays instead of objects.
* **JSON.parse(JSON.stringify())**: Can cause issues with cyclic references and is generally not recommended.

Keep in mind that performance differences between these methods may be negligible in many cases, and the choice ultimately depends on the specific requirements and coding style preferences.

Related benchmarks:

012942 (version: 0)

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

Created: 3 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):