Benchmark: Lodash isUndefined vs isNil

HTML Preparation code:

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

Tests:

isUndefined
let a = [1, 2, 3]; let b = _.isUndefined(a[4]);
isNil
let a = [1, 2, 3]; let b = _.isNil(a[4]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isUndefined
isNil

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
isUndefined	119262456.0 Ops/sec
isNil	119376064.0 Ops/sec

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.

**What is tested?**

The provided benchmark is testing two functions from the Lodash library: `_.isUndefined` and `_.isNil`. These functions are used to check if a value is undefined or null.

**Options compared:**

The benchmark is comparing the performance of these two functions in different scenarios. The options being compared are:

1. `_.isUndefined(a[4])`
2. `_.isNil(a[4])`

These tests are checking how the Lodash library's functions perform when dealing with arrays and trying to access an index that doesn't exist.

**Pros and Cons of each approach:**

Both approaches have their pros and cons:

1. `_.isUndefined(a[4])`:
	* Pros:
		+ This approach is more straightforward, as it directly checks if the value at the specified index is undefined.
	* Cons:
		+ It requires the array to already be created with a defined length (i.e., no `push` operations after the fourth element).
2. `_.isNil(a[4])`:
	* Pros:
		+ This approach is more concise and might be faster, as it avoids unnecessary checks.
	* Cons:
		+ It can return false positives if the array has a different length or structure than expected.

**Library:**

The Lodash library is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, object merging, and more. In this benchmark, the `_.isUndefined` and `_.isNil` functions are used to check if a value is undefined or null, respectively.

**Special JS feature/syntax:**

There are no special JavaScript features or syntaxes being tested in this benchmark. The tests only involve standard JavaScript variables and Lodash library functions.

**Other alternatives:**

If you didn't use the Lodash library for these specific functions, you could implement your own implementations using standard JavaScript:

1. `isUndefined(a[4])`:
	* Use a simple check like `if (a[4] === undefined)`.
2. `isNil(a[4])`:
	* Use a similar check like `if (a[4] === null)` or `if (!a[4] && typeof a[4] !== 'object')`.

However, implementing your own functions for these specific tasks would likely be less efficient and might not cover all edge cases.

**Benchmark preparation code:**

The provided HTML preparation code includes the Lodash library script tag, which loads the `lodash.min.js` file. This ensures that the Lodash functions are available when running the benchmark test cases.

The Script Preparation Code is empty, so no additional setup or initialization is required for this benchmark.

Related benchmarks:

Lodash isUndefined vs isNil (version: 0)

Comparing performance of: isUndefined vs isNil

Created: 3 years ago by: Guest

Jump to the latest result

isUndefined

isNil

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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