Benchmark: indexOf vs findIndex

Script Preparation code:


var arr = ['one', 'two', 'three'];

function test(){
	return 'one';
}

Tests:

findIndex
arr.findIndex(test())
indexOf
arr.indexOf(test())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex
indexOf

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 provided benchmark and explain what's being tested.

**Benchmark Definition**

The JSON defines a benchmark named "indexOf vs findIndex" that compares two ways of searching for an element in an array: `arr.indexOf(test())` and `arr.findIndex(test())`. The script preparation code creates an array `arr` with three elements, including the value of `test()`, which returns `'one'`.

**Options Compared**

Two options are being compared:

1. **`indexOf()`**: This method searches for the specified element in the array and returns its index if found, or `-1` if not found.
2. **`findIndex()`**: This method searches for the specified element in the array and returns its index if found, or `-1` if not found.

**Pros and Cons of Each Approach**

Both methods have their trade-offs:

* `indexOf()`: It's generally faster because it can return early as soon as it finds the element. However, it's less accurate when searching for an element that doesn't exist, because it returns `-1`, which might be interpreted as a valid index in some contexts.
* `findIndex()`: It's more accurate than `indexOf()` because it always returns a valid index, even if the element is not found (in which case it returns `-1`). However, it tends to be slower due to its more complex implementation.

**Library and Purpose**

There is no library used in this benchmark. Both `indexOf()` and `findIndex()` are built-in methods of the JavaScript array prototype.

**Special JS Feature/Syntax**

No special JS feature or syntax is being tested in this benchmark.

**Other Considerations**

When choosing between `indexOf()` and `findIndex()`, consider your specific use case:

* Use `indexOf()` when you know the element exists and are willing to accept its potential drawbacks.
* Use `findIndex()` when you want a more accurate way of searching for an element, even if it's slower.

**Alternatives**

Other alternatives to these methods include:

* Using `Array.prototype.some()` or `Array.prototype every()` with a callback function
* Implementing your own binary search algorithm

Keep in mind that the performance differences between these methods are usually relatively small and can be influenced by various factors, such as array size, element distribution, and browser optimizations.

Related benchmarks:

indexOf vs findIndex (version: 0)

Comparing performance of: findIndex vs indexOf

Created: 6 years ago by: Guest

Jump to the latest result

findIndex

indexOf

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):