Benchmark: lodash isNil vs !!

HTML Preparation code:

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

Script Preparation code:

var a = null;
var b = undefined;
var c = NaN;
var d = false;
var e = 'a';
var f = 0;

Tests:

lodash isNil
_.isNil(a); _.isNil(b); _.isNil(c); _.isNil(d); _.isNil(e); _.isNil(f);
native isNil
!!a !!b !!c !!d !!e !!f

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash isNil
native isNil

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Overview**

The benchmark measures the performance difference between two approaches to check if a value is null or undefined: using the `_.isNil` function from the Lodash library and a native JavaScript approach with double exclamation marks (`!!`) on individual values.

**Test Cases**

There are two test cases:

1. **Lodash isNil**: This test case uses the `_.isNil` function to check if each variable (`a`, `b`, `c`, `d`, `e`, and `f`) is null or undefined.
2. **Native isNil**: This test case uses double exclamation marks (`!!`) on individual values to achieve the same effect as `_.isNil`.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, object transformation, and more. In this case, `_.isNil` is used to check if a value is null or undefined.

The purpose of using Lodash in this benchmark is to compare the performance of its function with the native JavaScript approach.

**Native JavaScript Approach**

In the native JavaScript approach, double exclamation marks (`!!`) are used on individual values to check if they are truthy. In JavaScript, `0`, `''` (empty string), and `false` are considered falsy values, while all other values are considered truthy. By using `!!` on a value, we effectively remove its truthiness by converting it to a boolean (`true` or `false`). If the original value is null or undefined, `!!` will still return `null` or `undefined`, respectively.

The pros of this native approach include:

* It's a simple and lightweight solution.
* It doesn't require loading any additional libraries.

However, the cons include:

* It might not be as efficient as using a specialized library function like `_.isNil`.
* It may introduce performance overhead due to the double conversion.

**Pros and Cons of Using Lodash vs. Native Approach**

| Approach | Pros | Cons |
| --- | --- | --- |
| Lodash (`_.isNil`) | Efficient, well-tested, and widely supported | Requires loading additional library |
| Native JavaScript (`!!`) | Lightweight, simple | May introduce performance overhead |

**Other Considerations**

When considering the performance of these approaches, it's also important to think about other factors such as:

* Cache performance: If the value is cached, using `_.isNil` might incur additional cache misses.
* Object size and layout: For large objects or complex data structures, the native approach might be more efficient due to its simplicity.

**Alternatives**

Other alternatives for checking if a value is null or undefined include:

* Using the `typeof` operator with `null` and `undefined`: `typeof a == 'object' && !a`
* Using the `===` operator with `null` and `undefined`: `a === null || a === undefined`
* Implementing your own custom function using bitwise operations.

Keep in mind that these alternatives might have varying degrees of performance, readability, and maintainability compared to the Lodash approach.

Related benchmarks:

lodash isNil vs !! (version: 0)

Comparing performance of: lodash isNil vs native isNil

Created: 2 years ago by: Guest

Jump to the latest result

lodash isNil

native isNil

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):