Benchmark: Test copy methods

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.6.2/lodash.min.js'></script>

Script Preparation code:

var voucher = {
    "single": false,
    "applyOverTaxes": false,
    "discountType": "1",
    "value": 100,
    "minimumAmount": 0,
    "quantity": 1,
    "suffixLength": 8,
    "code": "IF5R0AFX",
    "vertical": [],
    "allowedPaymentMethods": [],
    "allowedBanks": [],
    "types": [],
    "partners": [],
    "startDate": "2020-10-21T00:00:00.000Z",
    "endDate": "2020-10-21T00:00:00.000Z",
    "applyed": false
}

Tests:

structuredClone
const copy = window.structuredClone(voucher);
JSON
const copy = JSON.parse(JSON.stringify(voucher));
cloneDeep
const copy = _.cloneDeep(voucher)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
structuredClone
JSON
cloneDeep

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 OPR/106.0.0.0

Browser/OS: Opera 106 on Windows

View result in a separate tab

cloneDeep

859K/s

JSON

769K/s

structuredClone

322K/s

View exact numbers

Test name	Executions per second
✓ cloneDeep	858,570 Ops/sec
JSON	768,581 Ops/sec
structuredClone	322,352 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON benchmark.

The benchmark is testing three different methods to create a copy of an object: `structuredClone`, `JSON.parse(JSON.stringify())`, and `_.cloneDeep`. The test cases are comparing the performance and efficiency of these three methods on various browsers (Opera 106).

**Options Being Compared**

1. **structuredClone**: This method creates a shallow clone of the given object. It's a relatively new method introduced in ECMAScript 2020.
2. **JSON.parse(JSON.stringify())**: This method uses JSON serialization to create a deep copy of the object. However, it has some limitations and potential issues with circular references.
3. **_.cloneDeep** (using Lodash library): This method creates a deep clone of the given object. It's a popular utility function for creating deep copies.

**Pros and Cons of Each Approach**

1. **structuredClone**:
	* Pros: Efficient, accurate, and modern. It's designed to create shallow clones.
	* Cons: Not supported in older browsers (before ECMAScript 2020), and it might not work correctly with circular references.
2. **JSON.parse(JSON.stringify())**:
	* Pros: Widely supported, easy to implement, and works well for simple objects.
	* Cons: Can be slow for large objects, may fail with circular references, and doesn't support custom object properties.
3. **_.cloneDeep** (Lodash library):
	* Pros: Robust, efficient, and widely supported. It can handle deep cloning of complex objects.
	* Cons: Requires including the Lodash library, which might add extra overhead.

**Library and Its Purpose**

The `JSON.parse(JSON.stringify())` method uses JSON serialization to create a copy of the object. However, this approach is not ideal because it:

* Can be slow for large objects
* Fails with circular references (since it only serializes the object's structure, not its contents)
* Doesn't support custom object properties

The `_.cloneDeep` method from Lodash library is designed to create a deep clone of the given object. It handles complex cloning scenarios and supports various data types.

**Special JS Feature or Syntax**

None mentioned in this benchmark. The methods being tested are all standard JavaScript functions or utility libraries (Lodash).

**Other Alternatives**

For creating copies of objects, other alternatives include:

* `Object.assign()` with a custom object
* `Array.prototype.slice()` for arrays
* `String.prototype.split()` and `String.prototype.concat()` for strings

Keep in mind that these alternatives might not be as efficient or robust as the methods being tested (structuredClone, JSON.parse(JSON.stringify()), and _.cloneDeep).

In conclusion, this benchmark is testing the performance of different methods for creating copies of objects. The results will help users understand which method to use depending on their specific requirements and constraints.

Test copy methods (version: 1) Benchmark.js

Comparing performance of: `structuredClone vs JSON vs cloneDeep`

Created: 2 years ago by: Registered User

Go to the latest result

structuredClone

JSON

cloneDeep

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Test copy methods (version: 1) Benchmark.js

Comparing performance of: structuredClone vs JSON vs cloneDeep

Created: 2 years ago by: Registered User

Go to the latest result

structuredClone

JSON

cloneDeep

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `structuredClone vs JSON vs cloneDeep`