Benchmark: lodash assign vs spread operator for arrays

HTML Preparation code:

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

Script Preparation code:

var person = [{ id: 1, label: "Foo" }];

Tests:

lodash
let copied = _.assign([], person);
native
let copied = [...person];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
native

Fastest: N/A

Slowest: N/A

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

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I'll break down the benchmark definition and test cases for you.

**Benchmark Definition: Lodash Assign vs Spread Operator for Arrays**

The benchmark is designed to measure the performance of two approaches:

1. **Lodash Assign**: Using the `lodash.assign()` function to create a copy of an array.
2. **Spread Operator (native)**: Using the spread operator (`...`) to create a copy of an array.

**Options Compared:**

* Lodash Assign vs Spread Operator (native)
* Both approaches aim to achieve the same goal: creating a copy of the input array `person`.

**Pros and Cons:**

1. **Lodash Assign**:
	* Pros: Easy to use, concise code, well-tested library.
	* Cons: Adds an extra dependency (`lodash`), may introduce overhead due to function calls.
2. **Spread Operator (native)**:
	* Pros: Native JavaScript implementation, potentially faster and more efficient.
	* Cons: Requires a modern browser or environment that supports the spread operator, can be less readable for some developers.

**Library: Lodash**

Lodash is a popular JavaScript utility library developed by Isaac Schlueter. It provides a vast collection of functions for tasks such as:
	+ Array manipulation (e.g., `assign()`, `map()`, `filter()`).
	+ String manipulation (e.g., `trim()`, `split()`, `replace()`).
	+ Object manipulation (e.g., `assign()`, `merge()`, `clone()`).

Lodash's `assign()` function is a crucial part of the benchmark, as it creates a new array by copying the properties from an object.

**Special JS Feature/Syntax: Spread Operator**

The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows you to expand an array or object into multiple arguments. In this benchmark, the spread operator is used to create a copy of the input array `person`.

**Other Considerations:**

* Both test cases measure the performance of creating an array copy, which is a common operation in JavaScript.
* The benchmark assumes that the input array `person` has only one element (a single object with `id` and `label` properties).

**Alternatives:**

1. **Array.prototype.slice()**: Another native method to create an array copy, which might be faster than the spread operator but still relies on modern browsers.
2. **Library functions**: Other libraries like Underscore.js or Ramda.js provide similar functionality to Lodash's `assign()` function.
3. **In-place array manipulation**: Some developers might consider in-place array manipulation (e.g., using a temporary variable) as an alternative, but this approach is often less efficient and less readable.

I hope this explanation helps you understand the benchmark definition and test cases!

Related benchmarks:

lodash assign vs spread operator for arrays (version: 0)

lodash assign vs spread operator

Comparing performance of: lodash vs native

Created: 5 years ago by: Guest

Jump to the latest result

lodash

native

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):