Benchmark: Object cloning with Lodash clone vs cloneDeep vs merge vs ES6 object spread vs ES6 Object.assign BIG

HTML Preparation code:

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

Script Preparation code:

var o = {
 a: {
   b: 1,
   c: 2,
   d: 3,
   j: {
     k: [1,2,3].fill('x', 2, 2000),
     l: [4,5,6].fill(0, 2, 4000)
   },
 },
 e: [1,2,3,4,5,6],
 f: 1,
 g: {
   h: 1,
 }
}

Tests:

Lodash clone
const a = _.clone(o)
Lodash cloneDeep
const a = _.cloneDeep(o)
Lodash merge
const a = _.merge({}, o)
ES6 spread
const a = { ...o }
ES6 Object.assign
const a = Object.assign({}, o)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash clone
Lodash cloneDeep
Lodash merge
ES6 spread
ES6 Object.assign

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark tests the performance of different approaches to create a shallow copy of an object. There are five test cases:

1. **Lodash clone**: Uses the `_.clone()` function from the Lodash library to create a copy of the original object.
2. **Lodash cloneDeep**: Uses the `_.cloneDeep()` function from the Lodash library to create a deep copy of the original object.
3. **Lodash merge**: Uses the `_.merge()` function from the Lodash library to merge the original object with an empty object, effectively creating a shallow copy.
4. **ES6 spread**: Uses the syntax `{ ...o }` to create a new object with all properties from the original object `o`.
5. **ES6 Object.assign**: Uses the `Object.assign()` function to create a new object with all properties from the original object `o`.

**Options Compared**

The benchmark compares the performance of these five approaches:

* **Lodash clone** and **Lodash cloneDeep**: These two functions use different techniques to create copies of objects. Lodash's `clone` function performs a shallow copy, while `cloneDeep` performs a deep copy.
* **Lodash merge** and **ES6 spread**: Both of these approaches create a new object with all properties from the original object, but they do so in different ways. `merge` uses the `_.merge()` function from Lodash, which recursively merges objects, while `spread` uses the syntax `{ ...o }`, which creates a new object by spreading the properties of `o`.
* **ES6 Object.assign**: This approach also creates a new object with all properties from the original object.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Lodash clone**:
	* Pros: Simple to use, fast.
	* Cons: Only performs a shallow copy.
2. **Lodash cloneDeep**:
	* Pros: Performs a deep copy, useful for complex objects.
	* Cons: Slower than `clone`.
3. **Lodash merge**:
	* Pros: Recursively merges objects, can handle nested properties.
	* Cons: Slower than spread or Object.assign.
4. **ES6 spread**:
	* Pros: Simple to use, fast.
	* Cons: Only performs a shallow copy.
5. **ES6 Object.assign**:
	* Pros: Fast, easy to use.
	* Cons: Does not perform a deep copy.

**Library Usage**

The benchmark uses the Lodash library for the `clone`, `cloneDeep`, and `merge` functions. The `Object.assign()` function is a built-in JavaScript function that does not require any external libraries.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark, aside from the ES6 spread syntax `{ ...o }`.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Safari/537.36

Browser/OS: Chrome 79 on Linux

View result in a separate tab

Test name	Executions per second
Lodash clone	1012929.8 Ops/sec
Lodash cloneDeep	139049.4 Ops/sec
Lodash merge	89523.1 Ops/sec
ES6 spread	10801710.0 Ops/sec
ES6 Object.assign	3226088.0 Ops/sec

Related benchmarks:

Object cloning with Lodash clone vs cloneDeep vs merge vs ES6 object spread vs ES6 Object.assign BIG (version: 0)

Comparing performance of: Lodash clone vs Lodash cloneDeep vs Lodash merge vs ES6 spread vs ES6 Object.assign

Created: 4 years ago by: Guest

Jump to the latest result

Lodash clone

Lodash cloneDeep

Lodash merge

ES6 spread

ES6 Object.assign

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):