Benchmark: BS test isEmpty - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

// empty array
window.foo1 = [];

// array of strings
window.foo2 = ['a', 'b', 'c', 'd', 'e'];

// array of objects
window.foo3 = [{ a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }, { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }, { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }];

Tests:

_.isEmpty(window.foo1);
_.isEmpty(window.foo1);
Array.isArray(window.foo1) && window.foo1.length === 0
Array.isArray(window.foo1) && window.foo1.length === 0
window.foo1?.length === 0
window.foo1?.length === 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEmpty(window.foo1);
Array.isArray(window.foo1) && window.foo1.length === 0
window.foo1?.length === 0

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 benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark, hosted on MeasureThat.net, tests three different ways to check if an array is empty in JavaScript. The array in question, `window.foo1`, is initialized as an empty array. The test cases compare the performance of three methods:

1. Using Lodash's `isEmpty` function
2. Using a traditional array length check with `Array.isArray` and indexing
3. Using a null-safe operator (`?.`) to access the `length` property

**Test Cases**

The three individual test cases are:

1. `_.isEmpty(window.foo1);`
	* This test case uses Lodash's `isEmpty` function to check if the array is empty.
2. `Array.isArray(window.foo1) && window.foo1.length === 0`
	* This test case uses a traditional approach to check if the array is empty by checking its type and length using `Array.isArray` and indexing into the array.
3. `window.foo1?.length === 0`
	* This test case uses a null-safe operator (`?.`) to access the `length` property of the array. If the array is not defined, the expression will short-circuit and return `false`, avoiding a potential TypeError.

**Library: Lodash**

The benchmark includes a reference to Lodash (a popular JavaScript utility library) in the HTML preparation code:
```html
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
```
Lodash's `isEmpty` function is used by test case 1 to check if an array is empty.

**Null-Safe Operator (`?.`)**

The null-safe operator (`?.`) was introduced in ECMAScript 2020 (ES12) and allows you to access properties of an object without worrying about null or undefined references. In test case 3, the expression `window.foo1?.length === 0` uses this operator to check if the array is empty. If the array is not defined, the expression will short-circuit and return `false`, avoiding a potential TypeError.

**Pros and Cons of Each Approach**

Here's a brief summary:

* **Lodash's `isEmpty` function**:
	+ Pros: concise and readable code
	+ Cons: requires an external library (Lodash) to be included, which may not be desirable for all use cases
* **Traditional array length check**:
	+ Pros: widely supported by most browsers, no additional libraries required
	+ Cons: less concise and readable code, potential for errors if incorrect order of operations is used
* **Null-Safe Operator (`?.`)**:
	+ Pros: concise and expressive code, helps avoid null/undefined references
	+ Cons: requires support for ECMAScript 2020 (ES12) or later, may not be supported by older browsers

**Other Alternatives**

If you're interested in exploring alternative ways to check if an array is empty, here are a few options:

* Using the `length` property and checking for 0 (`window.foo1.length === 0`)
* Using the `some()` method with a callback function that always returns false (`_.some(window.foo1, () => false)`)
* Using the `every()` method with a callback function that always returns true (`_.every(window.foo1, () => true)`)

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36

Browser/OS: Chrome 90 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.isEmpty(window.foo1);	3247860.0 Ops/sec
Array.isArray(window.foo1) && window.foo1.length === 0	2384964.0 Ops/sec
window.foo1?.length === 0	6457469.0 Ops/sec

Related benchmarks:

BS test isEmpty (version: 1)

Comparing performance of: _.isEmpty(window.foo1); vs Array.isArray(window.foo1) && window.foo1.length === 0 vs window.foo1?.length === 0

Created: 3 years ago by: Registered User

Jump to the latest result

_.isEmpty(window.foo1);

Array.isArray(window.foo1) && window.foo1.length === 0

window.foo1?.length === 0

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):