Benchmark: Assign vs spread test

Tests:

Spread
const obj = { food: "pizza", animal: "dog", anotherOne: true }; const newObj = { ...obj };
Assign
const obj = { food: "pizza", animal: "dog", anotherOne: true }; const newObj = Object.assign({}, obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Assign

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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Let's dive into the world of JavaScript microbenchmarks and analyze the provided benchmark.

**Benchmark Overview**

The provided JSON represents a simple benchmark test that compares two approaches: using the spread operator (`...`) to create a new object, and using `Object.assign()` to create a new object. The benchmark is designed to measure the performance difference between these two methods.

**Test Cases**

There are only two test cases:

1. **Spread**: This test case uses the spread operator to create a new object:
```javascript
const obj = { food: "pizza", animal: "dog", anotherOne: true };
const newObj = { ...obj };
```
The purpose of this test is to measure the performance of using the spread operator to create a new object.

2. **Assign**: This test case uses `Object.assign()` to create a new object:
```javascript
const obj = { food: "pizza", animal: "dog", anotherOne: true };
const newObj = Object.assign({}, obj);
```
The purpose of this test is to measure the performance of using `Object.assign()` to create a new object.

**Options Compared**

In this benchmark, only two options are compared:

1. **Spread Operator**: Using the spread operator (`...`) to create a new object.
2. **Object.assign()**: Using the `Object.assign()` method to create a new object.

**Pros and Cons of Each Approach:**

* **Spread Operator**:
	+ Pros:
		- Creates a shallow copy of the original object, which can be faster for simple objects with few properties.
		- More concise and expressive code.
	+ Cons:
		- Can lead to unexpected behavior if used incorrectly (e.g., spreading an array instead of an object).
		- May not work as expected when dealing with complex objects or nested structures.
* **Object.assign()**:
	+ Pros:
		- More flexible and powerful than the spread operator, allowing for more control over the copying process.
		- Works correctly even for complex objects and nested structures.
	+ Cons:
		- Can be less concise and expressive than the spread operator.
		- May lead to slower performance compared to the spread operator.

**Library/Dependencies**

There are no libraries or dependencies mentioned in the benchmark definition. However, it's worth noting that if a library was used, it could potentially impact the results of the benchmark.

**Special JS Features/Syntax**

The spread operator is a relatively modern JavaScript feature (introduced in ECMAScript 2018) and may not be supported by older browsers or environments. If you need to support older browsers, you might want to use `Object.assign()` instead.

**Other Alternatives**

If you're looking for alternative methods to create new objects, consider the following:

* Using `Array.prototype.slice()` (for arrays)
* Using a library like Lodash's `cloneDeep()`
* Using a library like Immutable.js

Keep in mind that each of these alternatives has its own trade-offs and may not be suitable for every use case.

Related benchmarks:

Assign vs spread test (version: 0)

title pretty much tells it

Comparing performance of: Spread vs Assign

Created: 4 years ago by: Guest

Jump to the latest result

Spread

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):