Benchmark: spread111 - MeasureThat.net

Tests:

1
let a = {k1: "", k2: ""}; a = {...a, k3: ""}
2
let a = {k1: "", k2: ""}; a.k3 = ""

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
1	44422524.0 Ops/sec
2	119272384.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll explain the benchmark in detail.

**What is being tested?**

The provided JSON represents two JavaScript microbenchmarks created using MeasureThat.net. The benchmarks test the performance of assigning values to object properties using different methods: using the spread operator (`{...a, k3: ""}`) and using dot notation (`a.k3 = ""`).

**Options being compared**

There are two options being compared:

1. **Using the spread operator**: `{...a, k3: ""}`. This method is used to create a new object by copying all properties from the original object `a`, and then adding the new property `k3`.
2. **Using dot notation**: `a.k3 = ""`. This method directly assigns the value `" "` to the property `k3` of the object `a`.

**Pros and Cons of each approach**

1. **Using the spread operator**:
	* Pros: More efficient and less error-prone, as it creates a new object instead of modifying an existing one.
	* Cons: Can be slower due to the overhead of creating a new object, and may require more memory.
2. **Using dot notation**:
	* Pros: Faster and more lightweight, as it only modifies an existing object.
	* Cons: Can lead to errors if not used carefully, especially in complex codebases.

**Other considerations**

The choice between these two approaches depends on the specific use case and performance requirements. If speed is a top priority and memory usage is not a concern, using dot notation might be preferred. However, if reliability and maintainability are more important, using the spread operator with its benefits for creating new objects might be a better choice.

**Library**

There is no explicit library mentioned in the provided JSON. The benchmarks seem to rely on built-in JavaScript features.

**Special JS feature or syntax**

No special JS features or syntax are used in these benchmarks. They only utilize basic object property assignment methods.

**Benchmark preparation code**

The benchmark preparation code is empty, which means that MeasureThat.net takes care of preparing the test environment and setting up the test data.

**Alternative approaches**

Other alternatives for testing object property assignments might include:

1. Using `Object.assign()` to assign values to an existing object.
2. Comparing the performance of using `new Object()` versus `a = {...}` (or `{...a, k3: ``}`) when creating a new object.
3. Testing the performance of using `Object.create()` or other methods for creating new objects.

Keep in mind that these alternatives might be less relevant to the specific use case of testing object property assignment performance.

Related benchmarks:

spread111 (version: 0)

Comparing performance of: 1 vs 2

Created: one year ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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