Benchmark: JS Object assign vs object new property 2

Tests:

Object assign
const firstObject = { sampleData: 'Hello world' } Object.assign(firstObject, { moreData: 'foo bar' })
Object new property
const firstObject = { sampleData: 'Hello world' } firstObject.moreData = 'foo bar';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object assign
Object new property

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark definition is an object that contains metadata about the test case, but it seems to be incomplete or empty in this example. Typically, a benchmark definition would specify the parameters, inputs, and expected outputs of the test case.

However, looking at the individual test cases, we can infer what's being tested:

* The first test case uses `Object.assign()` to merge two objects.
* The second test case uses the dot notation (`firstObject.moreData = 'foo bar';`) to add a new property to an object.

**Options Compared**

The two options compared are:

1. Using `Object.assign()` to merge two objects.
2. Using the dot notation to add a new property directly to an existing object.

**Pros and Cons of Each Approach**

* **Using `Object.assign()`**: This approach has several pros:
	+ It's widely supported across browsers and versions.
	+ It's more flexible, as it allows for merging multiple objects into one.
	+ However, it can be slower than the dot notation approach due to the overhead of creating a new object and then copying its properties.
* **Using the dot notation**: This approach has several pros:
	+ It's typically faster than `Object.assign()` because it avoids the overhead of creating a new object.
	+ It's more concise and easier to read in some cases.
	However, it also has some cons:
	+ It's not as flexible as `Object.assign()`, as it only allows for adding one property at a time.
	+ It may not be supported by older browsers or versions.

**Library Usage**

In the first test case, the library used is `Object`. The purpose of this library is to provide an object-oriented programming model that allows you to create and manipulate objects in JavaScript.

**Special JS Features/Syntax**

Neither of the two approaches uses any special JavaScript features or syntax. They are both standard JavaScript constructs that have been part of the language for a long time.

**Other Alternatives**

If you want to compare the performance of other ways to merge or add properties to an object, some alternatives could include:

* Using `JSON.parse(JSON.stringify(obj))` to create a deep copy of an object and then modify it.
* Using the spread operator (`{ ...obj, newProp: 'value' }`) to create a new object with merged properties.

However, these approaches are not typically used in production code, as they can be slower and less efficient than the dot notation approach.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser/OS: Chrome 87 on Mac OS X 10.15.2

View result in a separate tab

Test name	Executions per second
Object assign	5491459.5 Ops/sec
Object new property	923432512.0 Ops/sec

Related benchmarks:

JS Object assign vs object new property 2 (version: 0)

Comparing performance of: Object assign vs Object new property

Created: 3 years ago by: Guest

Jump to the latest result

Object assign

Object new property

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):