Benchmark: isArray: Native vs Underscore vs Lodash

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js'></script>

Script Preparation code:

var randomArray = Array.apply(null, Array(100)).map(function() {
	return Math.round(Math.random() * 1000);
});

// Underscore was loaded last, so this saves an instance of underscore and resets _ to it's previous value (lodash).
var _underscore = _.noConflict();
// This saves an instance of lodash and resets _ to it's previous value (undefined).
var _lodash = _.noConflict();

Tests:

Native
Array.isArray(randomArray);
Underscore
_underscore.isArray(randomArray);
Lodash
_lodash.isArray(randomArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native
Underscore
Lodash

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of three approaches: using native JavaScript, Underscore.js, and Lodash's `isArray` function.

**What's being tested?**

In this specific test case, we're checking how long it takes to determine whether an array is actually an array using three different methods:

1. **Native JavaScript**: Using the built-in `Array.isArray()` method.
2. **Underscore.js**: Loading Underscore.js and calling its `isArray()` method on the input array.
3. **Lodash**: Loading Lodash and calling its `isArray()` method on the input array.

**Options compared**

The benchmark is comparing the performance of these three approaches:

* **Native JavaScript**: The built-in `Array.isArray()` method.
* **Underscore.js**: Underscore's `isArray()` method, which is a utility function for determining if an object is an array.
* **Lodash**: Lodash's `isArray()` method, which is also a utility function for determining if an object is an array.

**Pros and Cons of each approach**

Here are some general pros and cons of each approach:

* **Native JavaScript (Array.isArray())**:
	+ Pros: Fastest possible performance, no additional dependencies.
	+ Cons: May not work as expected with certain data types or edge cases.
* **Underscore.js (isArray())**:
	+ Pros: Provides a reusable utility function for determining if an object is an array.
	+ Cons: Adds an extra dependency and may incur a small performance overhead due to the function call.
* **Lodash (isArray())**:
	+ Pros: Similar to Underscore's approach, but with some additional features and optimizations.
	+ Cons: Also adds an extra dependency and may incur a similar performance overhead.

**Library and purpose**

Both Underscore.js and Lodash are utility libraries that provide a set of reusable functions for common tasks in JavaScript. They were created by Jeremy Ashkenas (Underscore) and Isaac Schank (Lodash), respectively, as part of the Backbone.js project.

In this specific benchmark, both libraries are used to load their `isArray()` methods, which are then called on the input array to determine whether it's actually an array. The `_noConflict()` method is used to load these methods without creating multiple instances of the libraries.

**Special JS feature or syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that Lodash uses some advanced features like memoization and caching under the hood, which may affect its performance.

Related benchmarks:

isArray: Native vs Underscore vs Lodash (version: 0)

Comparing performance of: Native vs Underscore vs Lodash

Created: 5 years ago by: Registered User

Jump to the latest result

Native

Underscore

Lodash

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):