Benchmark: Array.isArray vs lodash isArray

HTML Preparation code:

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

Script Preparation code:

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}

var arr = [];
for(var i = 0; i < 5000; i++){
  arr.push({value:getRandomInt(100)});
}

var obj = {};

var str = "hello world";

Tests:

lodash
_.isArray(arr) _.isArray(obj) _.isArray(str)
native
Array.isArray(arr) Array.isArray(obj) Array.isArray(str)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
native

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0

Browser/OS: Chrome 145 on Windows

View result in a separate tab

Test name	Executions per second
lodash	118898336.0 Ops/sec
native	117143576.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its components, explaining what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark measures the performance of two approaches to check if an object is an array:

1. **Native JavaScript`Array.isArray()` method**: Using the built-in `Array.isArray()` function.
2. **Lodash `_.isArray()` function**: Using a utility function from the Lodash library, specifically `_.isArray()`, which provides a wrapper around the native implementation.

**Script Preparation Code**

The script preparation code creates an array of 5,000 objects with random values and two empty objects (`arr` and `obj`). It also defines a string variable (`str`). This setup is intended to simulate a real-world scenario where these checks might be used.

**Html Preparation Code**

The HTML preparation code includes the Lodash library (version 4.17.5) via a CDN link, which makes its functions available for use in the script.

**Individual Test Cases**

There are two test cases:

1. **Lodash`_.isArray()` function**: This test case uses the `_.isArray()` function from Lodash to check if `arr`, `obj`, and `str` are arrays.
2. **Native JavaScript`Array.isArray()` method**: This test case uses the built-in `Array.isArray()` function to perform the same checks.

**Pros and Cons of Each Approach**

1. **Lodash`_.isArray()` function**:
	* Pros: Lodash provides a consistent and reliable implementation across various browsers and environments.
	* Cons: It introduces an additional dependency (the Lodash library) and might incur a slight performance overhead due to the wrapper around the native implementation.
2. **Native JavaScript`Array.isArray()` method**:
	* Pros: It's a lightweight, built-in function that doesn't introduce any external dependencies.
	* Cons: Its behavior might vary across different browsers or environments (e.g., older versions of Internet Explorer had issues with `Array.isArray()`).

**Library and Purpose**

Lodash is a utility library for JavaScript that provides a collection of functional programming helpers. In this case, the `_isArray()` function from Lodash is used to check if an object is an array.

**Special JS Features or Syntax**

There are no special features or syntax mentioned in the benchmark setup that would affect its performance comparison. The focus is on comparing the performance of two approaches to checking array-like objects.

**Other Alternatives**

If you want to use other libraries or implementations for checking if an object is an array, consider:

* **Underscore.js**: Another popular utility library that provides a similar `_isArray()` function.
* **Es6 `Array.isArray()``**: If the target environment supports ES6 features, using the built-in `Array.isArray()` function can be a good option.

Keep in mind that these alternatives might introduce different dependencies or behaviors compared to Lodash and the native JavaScript implementation.

Related benchmarks:

Array.isArray vs lodash isArray (version: 0)

Comparing performance of: lodash vs native

Created: 2 years ago by: Guest

Jump to the latest result

lodash

native

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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