Benchmark: Lodash.js vs instanceof Array

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var arr = ['12', 'caca', 'maca', 'benchmark'];

Tests:

Native
arr instanceof Array;
Lodash.js filter
_.isArray(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native
Lodash.js filter

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Native	104309624.0 Ops/sec
Lodash.js filter	146332336.0 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 explanation into smaller parts.

**Benchmark Overview**

The provided benchmark measures the performance of two approaches to check if an object is an array: native JavaScript (`instanceof Array`) and using the Lodash library (`_.isArray(arr)`).

**Options Compared**

There are two options being compared:

1. **Native JavaScript (instanceof Array)**: This approach uses the built-in `instanceof` operator in JavaScript to check if an object is an instance of the `Array` constructor. This method is native to JavaScript and does not require any external libraries.
2. **Lodash.js filter (.isArray(arr))**: This approach uses the Lodash library, which provides a utility function called `_.isArray()`. This function takes an array-like object as input and returns a boolean value indicating whether it is an actual array.

**Pros and Cons of Each Approach**

1. **Native JavaScript (instanceof Array)**:
	* Pros: Fast, lightweight, and doesn't require any external libraries.
	* Cons: May not work correctly with all types of objects that can be coerced to arrays (e.g., numbers, strings).
2. **Lodash.js filter (.isArray(arr))**:
	* Pros: Robustly handles various types of array-like objects and can also handle null or undefined inputs.
	* Cons: Requires the Lodash library to be loaded, which may add overhead.

**Library Used - Lodash**

The Lodash library is a popular JavaScript utility belt that provides a wide range of functions for tasks like string manipulation, object manipulation, array manipulation, and more. In this benchmark, the `_.isArray()` function is used to check if an object is an actual array.

**Special JS Feature or Syntax (None)**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Other Alternatives**

If you're looking for alternative approaches to check if an object is an array, some options include:

1. **Array.isArray()**: This method was introduced in ECMAScript 2015 and can be used as a more modern alternative to `instanceof Array`.
2. **Some() and Array.prototype.includes()**: Some browsers support the `some()` method with an optional second argument (an array) that returns true if at least one element of the array passes the test implemented by the function.

Please note that these alternatives may not be supported in all browsers or environments, so it's essential to consider compatibility when choosing a method.

Related benchmarks:

Lodash.js vs instanceof Array (version: 0)

Comparing performance of: Native vs Lodash.js filter

Created: 5 years ago by: Guest

Jump to the latest result

Native

Lodash.js filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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