Benchmark: Length testing isEmpty vs length

HTML Preparation code:

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

Script Preparation code:

window.arr = []

for(let i = 0; i > 100; i++) {
  window.arr.push(i)
}

Tests:

_.isEmpty(window.arr)
_.isEmpty(window.arr)
length
window.arr.length === 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEmpty(window.arr)
length

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON to understand what is being tested.

**Script Preparation Code**

The script preparation code is used to create an array `window.arr` and populate it with 100 numbers from 0 to 99. This array will be used as input for the benchmark tests.

```javascript
for(let i = 0; i > 100; i++) {
  window.arr.push(i)
}
```

This code creates an empty array, then pushes 100 elements onto it using a `for` loop.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library version 4.17.4 from a CDN. This library is used in one of the benchmark tests.

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

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. **_.isEmpty(window.arr)**: This test case uses Lodash's `isEmpty` function to check if the `window.arr` array is empty. The `_` symbol refers to the Lodash namespace.
2. **length**: This test case checks if the length of the `window.arr` array is 0.

**Options Compared**

In this benchmark, two options are compared:

* Using the `_.isEmpty` function from Lodash to check if an array is empty
* Checking the length property directly on the array (`window.arr.length === 0`)

**Pros and Cons of Each Approach**

1. **Using _.isEmpty**: Pros:
	* More concise and readable code
	* Less prone to errors due to typos or incorrect logic
Cons:
	* Requires an external library (Lodash) to be loaded
	* May introduce additional overhead due to the load time of the library
2. **Checking length property directly**: Pros:
	* Faster, as it doesn't require loading an external library
	* More efficient, as it directly accesses the array's property
Cons:
	* Less readable and more prone to errors due to typos or incorrect logic

**Considerations**

When deciding between these two approaches, consider the following factors:

* Performance: If speed is critical, checking the length property directly might be a better choice.
* Readability and maintainability: Using `_.isEmpty` can make code more concise and readable, especially for developers who are familiar with Lodash.

**Library (Lodash)**

Lodash is a popular JavaScript utility library that provides a collection of functional programming helpers. In this benchmark, it's used to provide the `isEmpty` function, which checks if an array or value is empty.

**Special JS Feature or Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark. It only uses standard JavaScript and Lodash functions.

**Other Alternatives**

If you want to compare other approaches, here are some alternatives:

* Instead of using `_.isEmpty`, you could use a custom implementation that checks if the array is empty by checking its length.
* You could also compare different methods for accessing the array's length property, such as using the `length` property directly or using `array.length`.

For example, to implement a custom `_isEmpty` function:

```javascript
function isEmpty(arr) {
  return arr.length === 0;
}
```

To compare different accessors for the array's length property:

```javascript
function hasZeroLengthArray() {
  let arr = [];
  if (arr.length === 0) {
    // do something
  }
}
```

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Linux

View result in a separate tab

Test name	Executions per second
_.isEmpty(window.arr)	1839406.5 Ops/sec
length	3937108.0 Ops/sec

Related benchmarks:

Length testing isEmpty vs length (version: 0)

Comparing performance of: _.isEmpty(window.arr) vs length

Created: 4 years ago by: Guest

Jump to the latest result

_.isEmpty(window.arr)

length

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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