Benchmark: lodash assign vs spread operator properly

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 = {name: 'Frederick', lastName: 'Corcino Alejo'};

Tests:

lodash
let age = {age:15}; let copied = _.assign({}, person, age);
native
let age = {age: 15}; let copied = {...person, ...age};

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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**Benchmark Definition**

The benchmark tests two approaches to assign values to an object:

1. Using `lodash.assign()`
2. Using the spread operator (`...`)

**Script Preparation Code**

The script preparation code defines a variable `person` with a nested object:
```javascript
var person = {name: 'Frederick', lastName: 'Corcino Alejo'};
```
This setup is used as the source data for both benchmark definitions.

**Html Preparation Code**

An external library, `lodash.js`, is loaded via an HTML script tag to make the `lodash.assign()` function available:
```html
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
```
**Individual Test Cases**

There are two test cases:

1. **Lodash**: The benchmark definition uses `_.assign()` to create a copied object from `person` and the new `age` object:
```javascript
let age = {age: 15};
let copied = _.assign({}, person, age);
```
2. **Native**: The benchmark definition uses the spread operator (`...`) to create a copied object from `person` and the new `age` object:
```javascript
let age = {age: 15};
let copied = {...person, ...age};
```
**Pros and Cons of Each Approach**

1. **Lodash (`.assign()`)**:
	* Pros:
		+ More explicit and readable code.
		+ Less error-prone since it's a function with clear input/output expectations.
	* Cons:
		+ Requires an external library (`lodash.js`).
		+ Might be slower due to the overhead of calling an external function.
2. **Native (Spread Operator)**:
	* Pros:
		+ Faster execution since it's a built-in JavaScript feature.
		+ More concise and expressive code.
	* Cons:
		+ Might be less readable for developers unfamiliar with the spread operator.
		+ Error-prone if not used correctly.

**Library: Lodash**

Lodash is a popular utility library for JavaScript that provides a wide range of functions for tasks like array manipulation, object cloning, and more. In this benchmark, `lodash.assign()` is used to create a copied object from the input data.

**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 a new sequence of elements, creating a shallow copy of the original. In this benchmark, the spread operator is used to create a copied object from `person` and the new `age` object.

**Alternatives**

Other alternatives for object assignment might include:

* Using the `Object.assign()` method (built-in JavaScript function)
* Implementing a custom cloning function
* Using a different library or framework that provides an alternative implementation of object cloning

Keep in mind that these alternatives may have their own trade-offs and performance characteristics, depending on the specific use case and requirements.

Related benchmarks:

lodash assign vs spread operator properly (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):