Benchmark: find vs findIndex (Array prototype methods) object

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

Array.prototype.find
const item = arr.find(item => item == 1E5);
Array.prototype.findIndex
const index = arr.findIndex(item => item == 1E5); const item = arr[index]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.find
Array.prototype.findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:90.0) Gecko/20100101 Firefox/90.0

Browser/OS: Firefox 90 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Array.prototype.find	1472.3 Ops/sec
Array.prototype.findIndex	1486.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark is designed to measure the performance difference between two array methods: `find` and `findIndex`. The `find` method returns the first element in an array that satisfies the provided condition, while the `findIndex` method returns the index of the first element that satisfies the condition.

**Script Preparation Code**

The script preparation code generates a large array with 100,000 elements, where each element is assigned a unique value using a `while` loop. This creates a high-performance test case by ensuring that the array's size and data distribution are optimized for performance testing.

**Html Preparation Code**

Since there is no HTML preparation code provided, we can assume that the benchmark is running in a headless environment, such as Node.js or a browser's built-in JavaScript engine.

**Library Usage**

In this benchmark, the `Array` prototype methods `find` and `findIndex` are used without any additional libraries. These methods are part of the ECMAScript Standard Library, which means they are available by default in most modern browsers and JavaScript engines.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark that requires explanation. The code is straightforward and leverages standard array methods.

**Options Compared**

The two options being compared are:

1. `Array.prototype.find`
2. `Array.prototype.findIndex`

These two methods differ in their behavior when the condition is not met:

* `find` returns `undefined`, while
* `findIndex` returns `-1`.

This difference affects the performance of each method, as some browsers and JavaScript engines may optimize for these cases differently.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

**Array.prototype.find**

Pros:

* Simpler code: The condition is applied to a single element at a time.
* Fewer operations required: Only one operation is performed per iteration.

Cons:

* More iterations: Since the condition returns `undefined` if not met, more iterations may be required.
* Potential performance hit: Some browsers and engines might incur additional overhead due to the repeated checks.

**Array.prototype.findIndex**

Pros:

* Fewer iterations: The method stops as soon as it finds a match or reaches the end of the array.
* Potential performance advantage: Some browsers and engines might optimize for early returns, reducing overhead.

Cons:

* More complex code: The condition is applied to an index, which may require additional operations.
* Additional operations required: One extra operation is performed to retrieve the element at the found index.

**Other Considerations**

When choosing between `find` and `findIndex`, consider the following factors:

* Array size and data distribution: If your array has a high number of elements with unique values, `findIndex` might be faster.
* Condition complexity: If the condition is simple and doesn't require additional operations, `find` might be sufficient.
* Browser and engine support: Some browsers may optimize for one method over the other.

**Alternatives**

If you're looking for alternative approaches or want to explore different scenarios, consider the following options:

1. **Use a binary search algorithm**: For large arrays with sorted data, a binary search approach can outperform `find` and `findIndex`.
2. **Leverage native methods**: Some platforms (e.g., .NET) provide optimized array methods for specific use cases.
3. **Explore specialized libraries**: Libraries like Lodash or Ramda offer alternative implementations of these methods with potentially improved performance.

In summary, the benchmark compares two standard array methods: `find` and `findIndex`. The choice between them depends on factors like array size, data distribution, condition complexity, and browser support.

Related benchmarks:

find vs findIndex (Array prototype methods) object (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.find vs Array.prototype.findIndex

Created: 3 years ago by: Guest

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

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):