Benchmark: JS find vs indexOf 3

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 30000) arr[i] = i++;

Tests:

Array.find
const item = arr.find(item => item === 23000);
Array.indexOf
const index = arr.findIndex(item => item === 23000);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
Array.indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.109 Safari/537.36

Browser/OS: Chrome 98 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.find	17121.0 Ops/sec
Array.indexOf	17189.4 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark is comparing two JavaScript methods for finding an element in an array: `Array.prototype.find()` (also known as "find") and `Array.prototype.findIndex()`. Both methods are used to find the index of a specific element in the array. The benchmark aims to determine which method is faster, more efficient, or has better performance.

**Options Compared**

The two options being compared are:

1. **`Array.find()`**: This method returns the first element in the array that satisfies the provided condition. If no elements satisfy the condition, it returns `undefined`. It's a concise way to find an element in an array.
2. **`Array.findIndex()`**: This method returns the index of the first element in the array that satisfies the provided condition. If no elements satisfy the condition, it returns `-1`.

**Pros and Cons**

Here are some pros and cons of each approach:

* **`Array.find()`**:
	+ Pros: concise, easy to read, and use.
	+ Cons: might be slower than `findIndex()` for large arrays due to its iterative nature.
* **`Array.findIndex()`**:
	+ Pros: faster for large arrays since it returns the index directly, reducing unnecessary iterations.
	+ Cons: can be more verbose and less readable than `find()`.

In general, if you need to find an element in an array and don't care about its value, `findIndex()` might be a better choice. However, if readability and simplicity are more important, `find()` is the way to go.

**Library and Special JS Features**

The benchmark uses the built-in JavaScript Array prototype methods (`Array.prototype.find()` and `Array.prototype.findIndex()`) without any external libraries or special features like `let`, `const`, or ES6 classes. The script preparation code creates a large array of 30,000 elements using a simple iterative approach.

**Other Alternatives**

Some alternative approaches to find an element in an array include:

* Using the `for` loop with `Array.prototype.indexOf()`: `for (var i = 0; i < arr.length; i++) { if (arr[i] === 23000) { /* do something */ } }`
* Using `Array.prototype.some()` or `Array.prototype every()`: These methods can be slower than `findIndex()` and might not be suitable for this specific use case.
* Using external libraries like Lodash, which provides more advanced array methods.

Keep in mind that the choice of method ultimately depends on the specific requirements of your project and the characteristics of your data.

Related benchmarks:

JS find vs indexOf 3 (version: 0)

JS find vs indexOf

Comparing performance of: Array.find vs Array.indexOf

Created: 2 years ago by: Guest

Jump to the latest result

Array.find

Array.indexOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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