Benchmark: Lodash cloneDeep vs Lodash clone vs Array.splice() vs. Object.assign() vs Array.slice() vs Array.slice(0)

Lodash cloneDeep vs Lodash clone vs Array.splice() vs. Object.assign() vs Array.slice() vs Array.slice(0) (version: 0)

For times when a shallow copy is needed, what is the performance difference between these 6 methods.

Comparing performance of: Lodash cloneDeep vs Lodash clone vs Array.splice() vs Object.assign() vs Array,slice() vs Array.slice(0)

Created: 4 years ago by: Guest

Jump to the latest result

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js'></script>

Script Preparation code:

var arr = ['one', 'two', 'three', {four: 'five'}];

Tests:

Lodash cloneDeep
var myCopy = _.cloneDeep(arr)
Lodash clone
var myCopy = _.clone(arr)
Array.splice()
var myCopy = arr.splice(0, arr.length)
Object.assign()
var myCopy = Object.assign([], arr)
Array,slice()
var myCopy = arr.slice()
Array.slice(0)
var myCopy = arr.slice(0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Lodash clone
Array.splice()
Object.assign()
Array,slice()
Array.slice(0)

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks to compare the performance of different methods for various tasks.

The provided benchmark measures the performance difference between six methods for creating a shallow copy of an array:

1. Lodash `cloneDeep`
2. Lodash `clone`
3. `Array.splice()`
4. `Object.assign()`
5. `Array.slice()`
6. `Array.slice(0)`

**Method Comparison**

Here's a brief explanation of each method and their pros/cons:

### 1. Lodash `cloneDeep`

Lodash's `cloneDeep` is a deep copy function that recursively clones the entire object, including nested arrays and objects.

Pros: Creates an exact replica of the original object, preserves nested data structures.
Cons: Can be slow for large objects due to recursive cloning.

**Use case:** When you need to create an exact replica of an object with complex nested structures.

### 2. Lodash `clone`

Lodash's `clone` is a shallow copy function that creates a new array or object by copying the top-level properties of the original.

Pros: Fast and efficient, suitable for most use cases.
Cons: Does not preserve nested data structures.

**Use case:** When you need to create a quick copy of an object with simple top-level properties.

### 3. `Array.splice()`

`Array.splice()` modifies the original array by removing elements from the start or end and returning an array of removed elements.

Pros: Can be used for various tasks beyond just creating a copy.
Cons: Modifies the original array, not suitable for all use cases.

**Use case:** When you need to perform an in-place operation on an array.

### 4. `Object.assign()`

`Object.assign()` creates a new object by copying all enumerable own properties from one or more source objects.

Pros: Fast and efficient, suitable for most use cases.
Cons: Does not preserve nested data structures.

**Use case:** When you need to create a quick copy of an object with simple top-level properties.

### 5. `Array.slice()`

`Array.slice()` creates a shallow copy of a subset of elements from the end of an array, starting at the specified index.

Pros: Fast and efficient, suitable for most use cases.
Cons: Does not preserve nested data structures.

**Use case:** When you need to create a quick copy of a portion of an array.

### 6. `Array.slice(0)`

`Array.slice(0)` creates a shallow copy of the entire array, starting from the beginning and ending at index 0.

Pros: Fast and efficient, suitable for most use cases.
Cons: Does not preserve nested data structures.

**Use case:** When you need to create an exact replica of an array with no modifications.

**Library**

Lodash is a popular JavaScript library that provides various utility functions, including `cloneDeep` and `clone`.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

For creating shallow copies of objects and arrays, other alternatives to Lodash include:

* Vanilla JavaScript (`Array.prototype.slice()` or `Object.assign()`)
* MooTools (a similar library to Lodash)
* Underscore.js (another popular utility library)

For deep cloning objects with complex nested structures, other alternatives to Lodash's `cloneDeep` include:

* JSON.parse(JSON.stringify())
* A library like DeepClone or DeepCopy

Related benchmarks: