Benchmark: teste simple deep copy 2

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: [true, false, undefined, true]
};

var myCopy = null;

Tests:

json parse
myCopy = JSON.parse(JSON.stringify(MyObject));
simple copy
const removeDeepReference = (object) => { const newObject = {}; const keys = Object.keys(object) for (let index = 0; index < keys.length; index += 1) { const key = keys[index]; const arr = object[key] newObject[key] = arr.slice(0, arr.length); } return newObject; }; myCopy = removeDeepReference(MyObject)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
json parse
simple copy

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark tests two approaches for creating a deep copy of an object: using `JSON.parse(JSON.stringify(MyObject))` and implementing a custom function `removeDeepReference`.

**Script Preparation Code**

The script preparation code defines an object `MyObject` with a nested array `description`, which contains both boolean, false, undefined, and true values.

**Html Preparation Code**

The HTML preparation code includes a reference to the Lodash library (version 4.17.5), which is used in one of the test cases.

**Test Cases**

There are two test cases:

1. **"json parse"`**: This test case creates a deep copy of `MyObject` using `JSON.parse(JSON.stringify(MyObject))`. The `JSON.stringify()` function returns a string representation of the object, and then `JSON.parse()` parses this string back into an object.
2. **"simple copy"`**: This test case creates a deep copy of `MyObject` using a custom function `removeDeepReference`. This function iterates over each property of the object, recursively processes its value, and creates a new object with modified values.

**Library: Lodash**

The Lodash library is used in the "json parse" test case. Lodash provides a set of utility functions for tasks such as string manipulation, array manipulation, and object manipulation. In this specific case, `JSON.stringify()` is used to convert an object to a string representation, which can be parsed later to recreate the original object.

**Special JS Features/ Syntax**

There are no special JavaScript features or syntaxes used in these test cases.

**Options Compared**

The two test cases compare two approaches for creating a deep copy of an object:

* **Using `JSON.parse(JSON.stringify(MyObject))`**: This method creates a shallow copy of the object, as it only copies the top-level properties and does not recursively process nested objects.
* **Implementing a custom function `removeDeepReference"`**: This method creates a deep copy of the object by recursively processing each property and creating new objects for nested values.

**Pros and Cons**

Here are some pros and cons of each approach:

**Using `JSON.parse(JSON.stringify(MyObject))`**:

Pros:

* Simple and concise implementation
* Fast execution

Cons:

* Creates a shallow copy, not a deep copy
* May not work correctly with complex data structures (e.g., circular references)

**Implementing a custom function `removeDeepReference`**:

Pros:

* Creates a deep copy of the object
* Can handle complex data structures (e.g., circular references)

Cons:

* More complex and verbose implementation
* Slower execution compared to the `JSON.parse(JSON.stringify())` method

**Other Alternatives**

There are other approaches for creating a deep copy of an object in JavaScript, such as:

* Using a library like Immer or Ramda, which provide functions for creating immutable copies of objects.
* Implementing a custom function using recursion and/or iteration to process nested properties.
* Using the `Object.assign()` method with a spread operator (`{...}`) to create a shallow copy of an object.

However, the `removeDeepReference` function implemented in this benchmark is a simple and effective example of creating a deep copy using a recursive approach.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Linux

View result in a separate tab

Test name	Executions per second
json parse	927005.1 Ops/sec
simple copy	3392950.0 Ops/sec

Related benchmarks:

teste simple deep copy 2 (version: 0)

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

Comparing performance of: json parse vs simple copy

Created: one year ago by: Guest

Jump to the latest result

json parse

simple copy

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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