Benchmark: Object copy JSON vs Object.assign

Tests:

Spread
let object = {...{foo: "bar"}}
JSON
let object = JSON.parse(JSON.stringify({...{foo: "bar"}}))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
JSON

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its various components.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, which compares two approaches for creating a copy of an object:

1. **Object spread (using the spread operator)**: `let object = {...{foo: "bar"}}`
2. **JSON parsing**: `let object = JSON.parse(JSON.stringify({...{foo: "bar"}}))`

**Options being compared**

The benchmark compares these two approaches to create a copy of an object. The primary goal is to measure the performance difference between creating an object using the spread operator versus using JSON parsing.

**Pros and cons of each approach**

1. **Object spread (using the spread operator)**:
	* Pros: Simple, concise syntax, efficient in terms of memory usage.
	* Cons: May not work as expected when dealing with complex objects or nested structures.
2. **JSON parsing**:
	* Pros: Works well with complex objects and nested structures, provides a more explicit way to create an object copy.
	* Cons: May be slower due to the overhead of parsing JSON.

**Other considerations**

* The benchmark uses two identical test cases (`object = {...{foo: "bar"}}`) for both approaches, which ensures a fair comparison. However, in real-world scenarios, you might encounter different objects with varying properties and complexity.
* The benchmark assumes that the input object is small to medium-sized, as creating large objects can lead to performance issues.

**Library usage**

None of the test cases explicitly uses any libraries or external dependencies for their implementation.

**Special JavaScript features or syntax**

The use of the spread operator (`{...}`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for concise object creation and copying. The JSON parsing method, on the other hand, relies on the `JSON` object and its methods.

**Other alternatives**

If you wanted to test alternative approaches, some options could be:

* Using a library like Lodash or Underscore.js, which provides utility functions for creating object copies.
* Implementing a custom clone function using recursion or iteration.
* Using a different data structure, such as an array with `push` and `slice`, to create an object copy.

Keep in mind that these alternatives might introduce additional complexity or overhead compared to the original approaches being tested.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36

Browser/OS: Chrome 88 on Windows

View result in a separate tab

Test name	Executions per second
Spread	66183720.0 Ops/sec
JSON	574785.6 Ops/sec

Related benchmarks:

Object copy JSON vs Object.assign (version: 0)

Comparing performance of: Spread vs JSON

Created: 3 years ago by: Guest

Jump to the latest result

Spread

JSON

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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