Benchmark: find vs findIndex with accesing the elemnt through index

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 element = 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: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.find	6751.9 Ops/sec
Array.prototype.findIndex	6948.4 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's being tested on MeasureThat.net.

**Benchmark Definition**

The benchmark measures which method is faster: using `find` or `findIndex` to access an element in an array by its index. The test case generates a large array of 100,000 elements, where each element is set to its index value (e.g., `arr[0] = 0`, `arr[1] = 1`, and so on).

**Options Compared**

The two options being compared are:

1. **`Array.prototype.find`**: This method returns the first element in an array that satisfies a provided condition, or undefined if no such element is found.
2. **`Array.prototype.findIndex`**: This method returns the index of the first element in an array that satisfies a provided condition, or -1 if no such element is found.

**Pros and Cons**

Here are some pros and cons of each approach:

* **`find`**:
	+ Pros: Simple to implement, easy to read.
	+ Cons: May be slower than `findIndex` for large arrays because it needs to iterate through the entire array until it finds a match, even if it's not necessary (e.g., if the condition is false for most elements).
* **`findIndex`**:
	+ Pros: Faster than `find` for large arrays because it stops iterating as soon as it finds a match.
	+ Cons: More complex to implement, may be harder to understand.

**Library and Purpose**

There are no external libraries used in this benchmark. The array is created using JavaScript's built-in syntax.

**Special JS Feature or Syntax**

None of the test cases uses any special JavaScript features or syntax that would affect their performance. They only use standard JavaScript methods (`find`, `findIndex`) and basic array operations (iteration).

**Other Alternatives**

If you were to optimize this benchmark, you might consider using:

1. **`map`**: Instead of iterating through the entire array, you could use `map()` to create a new array with the index values. This would eliminate the need for indexing into the original array.
2. **NativeArray methods**: Depending on the JavaScript engine and platform, native array methods like `Array.prototype.get()` or `TypedArray.prototype[index]` might be faster than `findIndex`.
3. **SIMD instructions**: If you're targeting a modern browser that supports SIMD (Single Instruction, Multiple Data) instructions, you could use optimized SIMD implementations of the `find` and `findIndex` methods to take advantage of parallel processing.

Keep in mind that these optimizations would require additional effort and expertise, and might not always lead to significant performance improvements.

Related benchmarks:

find vs findIndex with accesing the elemnt through index (version: 0)

Measuring which is faster test

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

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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