Benchmark: test clone deep - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:


function x(clone, obj) {
   for(var i in obj)
     clone[i] = (typeof obj[i] == "object" && obj[i] != null) ? x(obj[i].constructor(), obj[i]) : obj[i];
   return clone;
}

var copyArray = [];
var copyObject = {
  id: 1,
  name: "Hello",
  x: true,
  i: {
    y: false,
    a: {
      b: {
        nested: true,
        last: "world"
      },
      foo: "bar"
    }
  }
};

for(var i = 0; i < 10000; i++) {
  copyArray.push(_.cloneDeep(copyObject));
}

Tests:

Copy Array x
var y = x([], copyArray);
Copy Array lodash
var y = _.cloneDeep(copyArray)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Copy Array x
Copy Array lodash

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared options, pros and cons, library usage, special JS features, and alternatives.

**Benchmark Overview**

The test case measures the performance of creating a deep clone of an array object in two different ways:

1. **Custom implementation**: The `x` function creates a deep clone of an object by recursively traversing its properties.
2. **Lodash's `cloneDeep` function**: A popular utility library for functional programming, Lodash provides a built-in function for creating deep clones.

**Options Compared**

The two options being compared are:

1. **Custom implementation (x function)**:
	* Pros: Allows for customization of the cloning process, can be optimized for specific use cases.
	* Cons: Requires more code and logic, may introduce overhead due to branching or recursion.
2. **Lodash's `cloneDeep` function**:
	* Pros: Provides a well-tested, optimized implementation with minimal code changes, allows for easy reuse across projects.
	* Cons: Adds an external dependency on Lodash.

**Library Usage**

In the benchmark preparation code, Lodash is loaded via a CDN link (`https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js`). This suggests that the test case aims to compare the performance of the custom implementation against the well-established `cloneDeep` function from Lodash.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark, but it's worth noting that the use of Lodash and its `cloneDeep` function might not be familiar to all developers. However, Lodash is a widely used library with many benefits, including performance optimizations for common tasks like cloning objects.

**Alternatives**

For creating deep clones, other alternatives include:

1. **Array.prototype.slice() and Object.assign()**: These methods can create shallow copies of arrays and objects, respectively.
2. **For...of loops and object properties iteration**: This approach can be used to create a custom clone function but may not provide the same level of performance as optimized library implementations like Lodash's `cloneDeep`.
3. **JSON.parse() and JSON.stringify()**: These methods can serialize and deserialize objects, respectively, which can be used to create a deep clone.

However, these alternatives might not offer the same performance benefits or ease of use as using an established library like Lodash.

**Benchmark Results**

The latest benchmark results show that:

1. The custom implementation (`x` function) performs significantly better than the `cloneDeep` function from Lodash.
2. Both implementations have a similar execution frequency, indicating that the performance difference lies in the overhead introduced by loading and using an external library like Lodash.

Keep in mind that these results might vary depending on specific use cases, hardware configurations, and JavaScript engine optimizations.

Related benchmarks:

test clone deep (version: 0)

Comparing performance of: Copy Array x vs Copy Array lodash

Created: 7 years ago by: Guest

Jump to the latest result

Copy Array x

Copy Array lodash

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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