Benchmark: JavaScript spread operator vs Object.assign performance new obj

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):

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**What is being tested?**

The provided benchmark measures the performance difference between two approaches: using the JavaScript spread operator (`...`) to merge objects and `Object.assign()`.

**Options compared:**

There are two options being compared:

1. **Using the spread operator**: The syntax `{ ...firstObject, ...secondObject }` is used to merge two objects, `firstObject` and `secondObject`, into a new object, `finalObject`.
2. **Using Object.assign()`: The `Object.assign()` method is used to create a new object by copying all enumerable own properties from one or more source objects into a target object.

**Pros and Cons of each approach:**

* **Using the spread operator**:
	+ Pros:
		- More concise and readable syntax.
		- Can be faster due to the compiler optimizations for this specific use case.
	+ Cons:
		- May not work as expected if used with non-object literals or complex data structures.
		- Performance may vary depending on the JavaScript engine and browser implementation.
* **Using Object.assign()**:
	+ Pros:
		- More versatile and flexible, working with various types of objects and data structures.
		- Easier to debug and maintain due to its well-established API.
	+ Cons:
		- Less readable syntax, requiring more explicit code.

**Library/Functionality:**

The `Object.assign()` method is a built-in JavaScript function that belongs to the ECMAScript standard. It's widely supported across different browsers and environments.

**Special JS features/syntax:**

This benchmark does not use any special or experimental JavaScript features or syntax.

**Other alternatives:**

If you're interested in exploring alternative methods for merging objects, some other options include:

* `reduce()`: You can use the `reduce()` method to merge two arrays into a new array.
* `concat()`: The `concat()` method can be used with an array of objects to merge them.
* Custom functions or libraries (e.g., Lodash's `merge()` function)

Keep in mind that each approach has its trade-offs and use cases, so it's essential to choose the most suitable one depending on your specific requirements.

**Benchmark preparation code:**

The provided `Script Preparation Code` is empty, which means that any custom setup or configuration for the benchmark should be done within the individual test case definitions. The `Html Preparation Code` is also empty, indicating that no HTML-specific setup is required for this benchmark.

Related benchmarks:

JavaScript spread operator vs Object.assign performance new obj (version: 0)

Using the spread operator vs Using Object.assign

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):