Benchmark: TW - spread vs object.assign

Tests:

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

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:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.1 Safari/605.1.15

Browser/OS: Safari 13 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
Using the spread operator	2109471.2 Ops/sec
Using Object.assign	4311803.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two ways to create a new object that inherits properties from an existing object: using the spread operator (`...`) and `Object.assign()`.

**Options Being Compared**

1. **Spread Operator (`...`)**: This syntax creates a new object by copying all enumerable own properties from the original object.
2. **`Object.assign()`**: This method creates a new object with the specified properties, which can be copied from other objects or created manually.

**Pros and Cons of Each Approach**

1. **Spread Operator (`...`)**
	* Pros:
		+ More concise and expressive syntax.
		+ Can be used to create new objects quickly.
	* Cons:
		+ May have performance implications due to the overhead of creating a new array for property names.
2. **`Object.assign()`**
	* Pros:
		+ More flexible, as it allows specifying source objects and their properties separately.
		+ Can be used to create new objects with existing properties while adding or updating others.
	* Cons:
		+ May have performance implications due to the overhead of creating a new object and copying properties.

**Library and Special JS Features**

In this benchmark, no libraries are explicitly mentioned. However, it's worth noting that `Object.assign()` is a built-in method in JavaScript since ES6 (ECMAScript 2015).

There are no special JavaScript features being tested in this benchmark, as the focus is solely on the two comparison methods.

**Other Alternatives**

For creating new objects with inherited properties, other alternatives to the spread operator and `Object.assign()` include:

1. **`Object.create()`**: This method creates a new object based on a prototype or existing object.
2. **`Object.keys()`, `.map()`, and `.reduce()`**: These methods can be used to create a new object by iterating over an array of property names and assigning their values.

While these alternatives exist, the spread operator and `Object.assign()` are generally considered more concise and efficient for simple cases.

**Benchmark Preparation Code**

The benchmark preparation code is not provided in the question. However, based on the benchmark definition and test cases, it's likely that the script preparation code would include:

```javascript
const firstObject = { sampleData: 'Hello world' };

// Using spread operator
const finalObjectSpread = {
  ...firstObject,
};

// Using Object.assign()
const finalObjectAssign = Object.assign({}, firstObject);
```

This code creates two example objects (`firstObject` and an empty object) to be used in the benchmark.

Related benchmarks:

TW - spread vs object.assign (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>

Experimental features:

Fastest: N/A

Slowest: N/A

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