Benchmark: JavaScript spread operator vs Object.assign performance 11

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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Let's break down what's being tested on the provided JSON benchmark.

**Benchmark Definition**

The benchmark is defined by the script preparation code, which consists of two examples:

1. Using the spread operator (`...`): This syntax was introduced in ECMAScript 2018 (ES2018) and allows you to expand an object into a new object.
2. Using `Object.assign()`: This method is used to copy properties from one or more source objects to a target object.

**Options being compared**

The two options are:

* Using the spread operator (`...`)
* Using `Object.assign()`

These options are being compared in terms of performance, specifically in terms of how many executions per second they can achieve on a Chrome 116 browser on a Windows desktop platform.

**Pros and Cons of each approach**

1. **Using the spread operator (`...`)**:
	* Pros:
		+ More concise and readable syntax
		+ Easier to use when dealing with simple objects
	* Cons:
		+ May be slower due to method call overhead (in JavaScript, methods are functions that can be invoked on an object)
2. **Using `Object.assign()`**:
	* Pros:
		+ Faster than the spread operator because it avoids method call overhead
		+ More efficient for large objects or complex data structures
	* Cons:
		+ Less readable syntax compared to the spread operator

**Library and purpose**

The only library mentioned in the benchmark is `Object.assign()`, which is a built-in method in JavaScript that allows you to copy properties from one or more source objects to a target object.

**Special JS feature or syntax**

None of the test cases use any special JavaScript features or syntax beyond what's mentioned above (ECMAScript 2018 and `Object.assign()`).

**Other alternatives**

There are other ways to merge objects in JavaScript, such as:

* Using the `merge` function from a library like Lodash
* Using a custom implementation of object merging
* Using template literals (`{ ... }`) which was introduced in ECMAScript 2015 (ES6) and allows you to merge two objects into one

However, these alternatives are not being compared in this benchmark.

Keep in mind that performance differences between these options may vary depending on the specific use case, data size, and browser version.

Related benchmarks:

JavaScript spread operator vs Object.assign performance 11 (version: 0)

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

Created: 2 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):