Benchmark: Array find vs findIndex

Tests:

findIndex
const array = Array(500).fill().map((e,i)=>i) const elementIndex = array.findIndex((e) => e === 400) if (elementIndex >= 0) { console.log(array[elementIndex]) }
find
const array = Array(500).fill().map((e,i)=>i) const element = array.find((e) => e === 400) console.log(element)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex
find

Fastest: N/A

Slowest: N/A

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/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Linux

View result in a separate tab

Test name	Executions per second
findIndex	68525.9 Ops/sec
find	67713.7 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 JSON data and explain what is being tested, compared, and analyzed.

**Benchmark Definition**

The JSON data represents a benchmark definition for testing two JavaScript methods: `Array.find()` and `Array.findIndex()`. The name of the benchmark is "Array find vs findIndex".

**Script Preparation Code**

Since there is no script preparation code provided, it means that the test cases will be run in isolation without any additional setup or dependencies.

**Html Preparation Code**

Similarly, there is no html preparation code specified, which implies that the test environment is not requiring a specific HTML structure or content for the tests to execute.

**Individual Test Cases**

There are two test cases:

1. `findIndex`:
The benchmark definition contains code using the `Array.findIndex()` method to find an element with a specific value (400) in an array of 500 elements.
2. `find`:
The second test case uses the `Array.find()` method to achieve the same goal as the first test case.

**Options Compared**

In this benchmark, two options are being compared:

* **Array.findIndex()**: This method returns the index of the first element that satisfies the provided condition (in this case, finding an element with a value of 400). If no such element is found, it returns -1.
* **Array.find()**: This method returns the first element in the array that satisfies the provided condition. If no such element is found, it returns undefined.

**Pros and Cons**

Here are some pros and cons associated with each approach:

**Array.findIndex():**

Pros:

* Can be more efficient when searching for an exact match, as it only needs to iterate through a portion of the array.
* Returns the index of the matched element, which can be useful in certain situations.

Cons:

* Returns -1 if no matching element is found, whereas `Array.find()` returns undefined.
* May be slower than `Array.find()` for larger arrays due to the additional iteration needed to find the exact index.

**Array.find():**

Pros:

* Returns a meaningful value (the matched element) instead of an index or null/undefined.
* Can be more readable and concise, as it avoids the need to calculate indices.

Cons:

* Requires the element being searched for, whereas `Array.findIndex()` only needs to know the search criteria.
* May be slower than `Array.findIndex()` due to the additional iteration needed to find the entire matched element.

**Other Considerations**

In terms of JavaScript features or syntax, neither of these methods relies on any specific features. They are both relatively simple and widely supported in most modern browsers.

**Library Usage**

Neither of these methods uses a specific library. The `Array` object is a built-in JavaScript array object that provides these two methods.

**Special JS Feature or Syntax**

There are no special JS features or syntax involved in these tests, as they only focus on the basic functionality of the two methods.

**Other Alternatives**

If you need to compare other approaches for finding elements in an array, some alternatives could be:

* Using `Array.prototype.some()` and checking the result manually
* Using a custom loop with indexing variables
* Using a library like Lodash or Ramda that provides more advanced array functions

However, for most use cases, using the built-in `Array.findIndex()` and `Array.find()` methods is likely to be the most efficient and readable approach.

Related benchmarks:

Array find vs findIndex (version: 0)

Comparing performance of: findIndex vs find

Created: 2 years ago by: Guest

Jump to the latest result

findIndex

find

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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