Benchmark: find vs findIndex (Array prototype methods) with console.log

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); console.log(item);
Array.prototype.findIndex
const index = arr.findIndex(item => item == 1E5); console.log(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 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36

Browser/OS: Chrome 94 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.find	1263.7 Ops/sec
Array.prototype.findIndex	1250.6 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 benchmark and its test cases.

**What is being tested?**

The provided JSON represents two microbenchmarks that measure the performance of `find` and `findIndex` methods on arrays in JavaScript, specifically with console.log statements.

**Options compared:**

Two options are compared:

1. `Array.prototype.find`: This method returns the first element in an array that satisfies the provided testing function.
2. `Array.prototype.findIndex`: This method returns the index of the first element in an array that satisfies the provided testing function, and returns -1 if no such element is found.

**Pros and Cons:**

- **`find`**: Pros:
	* Simpler to understand and implement.
	* Might be faster due to its optimized implementation (it stops searching as soon as it finds a match).
Cons:
	* Returns the actual element, not just its index.
	* May not be suitable for finding an index in an array.
- **`findIndex`**: Pros:
	+ Returns the exact index of the found element.
	+ Suitable for finding an index in an array.
Cons:
	+ Might be slower due to its need to stop searching once it finds a match, but this is not always the case and can depend on the specific implementation and testing function.

**Other considerations:**

- The `console.log` statement at the end of each benchmark definition can affect performance, as it introduces additional overhead. In a real-world scenario, you might want to remove or minimize this logging.
- The size of the array being used (100000 elements) is relatively small compared to typical use cases. Larger arrays would likely show more significant differences between `find` and `findIndex`.
- The use of `1E5` as a testing value for finding the largest element might not be representative of all scenarios, especially if you're searching for smaller values.

**Library usage:**

There is no library explicitly mentioned in the provided benchmark definition. However, both methods are part of the built-in Array prototype in JavaScript.

**Special JS features or syntax:**

The benchmarks use a modern JavaScript feature called "arrow functions" (`item => item == 1E5`), which is supported by most modern browsers and Node.js versions.

**Alternatives:**

Other alternatives to `find` and `findIndex` include:

- Using `forEach`: While not as efficient as `find` or `findIndex`, you can use `forEach` in combination with the `index` variable from `findIndex` to find an element.
- Implementing a custom loop: You could manually iterate through the array using a for loop, but this would be less efficient and more error-prone than using built-in methods like `find` or `findIndex`.
- Using other libraries or modules: Depending on your specific requirements, you might consider using external libraries that provide optimized array searching functionality, such as Lodash's `findIndex`.

Related benchmarks:

find vs findIndex (Array prototype methods) with console.log (version: 0)

Measuring which is faster

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

Created: 4 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 2 months ago):