Benchmark: Spread Operator vs Lodash (v4.17.21)

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

var arr = new Array(100000000).fill(0);

Tests:

Spread Operator
[...arr];
Lodash Clone
_.clone(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread Operator
Lodash Clone

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares the performance of the spread operator (`[...]`) versus Lodash's `clone()` function for cloning an array of 100 million elements.

**Options Compared**

1. **Spread Operator ( `[...arr]` )**: This approach uses the spread operator to create a new array by copying the elements from the original array, `arr`. The spread operator is a built-in JavaScript feature that allows you to duplicate arrays or objects.
2. **Lodash Clone ( `_.clone(arr)` )**: This approach uses Lodash's `clone()` function to create a deep copy of the original array, `arr`.

**Pros and Cons**

* Spread Operator:
	+ Pros:
		- Lightweight and efficient, as it only creates a new array reference.
		- Can be faster than cloning because it doesn't require creating an entirely new object graph.
	+ Cons:
		- May not work correctly if the original array contains cyclic references or complex data structures.
		- Can be slower for very large arrays due to the overhead of creating multiple elements in memory.
* Lodash Clone:
	+ Pros:
		- Provides a safe and robust way to create deep copies of arrays, handling complex data structures and cyclic references.
	+ Cons:
		- Adds an external dependency (Lodash) to the benchmark.
		- May be slower due to the overhead of creating a new object graph.

**Library: Lodash**

Lodash is a popular JavaScript library that provides a wide range of utility functions, including array manipulation. In this case, it's used for its `clone()` function, which creates a deep copy of an array.

**Special JS Feature/Syntax**

None are explicitly mentioned in the benchmark definition or test cases. However, note that modern JavaScript engines often optimize certain built-in operators and functions, such as the spread operator.

**Alternatives**

Other alternatives to compare might include:

1. **Array.prototype.slice()**: Creates a shallow copy of an array.
2. **Array.prototype.concat()**: Creates a new array by concatenating multiple arrays or values.
3. **Recursive array cloning**: Manually creates a deep copy of the original array using recursion.

However, these alternatives may not be as efficient as the spread operator and Lodash Clone for large arrays, respectively.

Related benchmarks:

Spread Operator vs Lodash (v4.17.21) (version: 0)

Answering https://stackoverflow.com/questions/58702513/lodash-clone-array-vs-spread-operator#

Comparing performance of: Spread Operator vs Lodash Clone

Created: 3 years ago by: Guest

Jump to the latest result

Spread Operator

Lodash Clone

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):