Benchmark: JS find + indexOf vs findIndex

Script Preparation code:

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

Tests:

Array.find + Array.indexOf
const item = arr.find(item => item === 1E5) const index = arr.indexOf(1E5) const result = { item, index }
Array.findIndex
const index = arr.findIndex(item => item === 1E5); const item = arr[index] const result = { item, index }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find + Array.indexOf
Array.findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Overview**

The benchmark compares two approaches for finding an element in an array: `find` with `indexOf`, and `findIndex`.

**Script Preparation Code**

The script preparation code generates an array of 100,000 elements, each initialized to its index (i.e., `arr[i] = i;`). This creates a large array that's likely to be used in the benchmark.

**Benchmark Definition**

There are two individual test cases:

1. **Array.find + Array.indexOf**: This test case finds an element using `find` and then uses `indexOf` to get its index.
2. **Array.findIndex**: This test case uses `findIndex` directly to find an element's index without using `find` or `indexOf`.

**Libraries**

None of the benchmark definitions use a specific library.

**Special JS Features/Syntax**

The benchmark uses a few special JavaScript features:

* The arrow function syntax (`=>`) in the `find` and `findIndex` calls.
* The template literals (e.g., `"const item = arr.find(item => item === 1E5)"`).

**Options Compared**

The two test cases compare two approaches for finding an element in an array:

* **Find with Index**: Using `find` to find the element and then using `indexOf` to get its index.
* **FindIndex**: Using `findIndex` directly to find an element's index.

**Pros and Cons of Each Approach**

Here are some pros and cons for each approach:

* **Find with Index**:
	+ Pros:
		- Can be faster if the array is very large, since `indexOf` can stop searching as soon as it finds a match.
	+ Cons:
		- Requires two separate operations (find and then index), which may lead to overhead.
		- May not be suitable for arrays with duplicate elements.
* **FindIndex**:
	+ Pros:
		- More concise and expressive, as it combines the find and index operations into one step.
		- May be faster since it only requires a single operation.
	+ Cons:
		- May not work correctly if the array has duplicate elements (since `findIndex` returns the first matching element).
		- Can lead to performance issues if the array is very large.

**Other Considerations**

The benchmark likely aims to measure which approach is faster and more efficient for finding an element in a large array. The test cases use a relatively simple array generation scheme, but in real-world scenarios, arrays can be much larger and more complex.

**Alternatives**

If you're looking for alternative approaches, consider the following:

* **Binary Search**: For very large arrays, binary search can be a more efficient approach than finding an element using `find` or `indexOf`. However, this requires a sorted array.
* **Iterative Approach**: Instead of using built-in functions like `find`, `findIndex`, and `indexOf`, you could implement your own iterative solution to find an element in the array. This can be more efficient if the array is very large, but it requires more code and may lead to overhead.

In summary, the benchmark compares two approaches for finding an element in an array: `find` with `indexOf` and `findIndex`. The `FindIndex` approach is likely to be faster since it combines the find and index operations into one step. However, it's essential to consider the trade-offs between performance, conciseness, and expressiveness when choosing a solution for finding elements in arrays.

Related benchmarks:

JS find + indexOf vs findIndex (version: 0)

JS find + indexOf vs findIndex

Comparing performance of: Array.find + Array.indexOf vs Array.findIndex

Created: 2 years ago by: Guest

Jump to the latest result

Array.find + Array.indexOf

Array.findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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