Benchmark: find vs findIndex vs some

Script Preparation code:

var data = [];

for (let i = 0; i < 5000; ++i) {
  data.push({ username: 'as' });
}

data.push({ username: 'lts' });

for (let i = 0; i < 2500; ++i) {
  data.push({ username: 'as' });
}

Tests:

find
data.find(e => e.username === 'lts')
findIndex
data.findIndex(e => e.username === 'lts')
some
data.some(e => e.username === 'lts')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
findIndex
some

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 benchmarking setup.

**Benchmark Definition JSON and Preparation Code**

The provided Benchmark Definition JSON defines three test cases:

* `find`: finds an element in the array that matches a certain condition (`e => e.username === 'lts'`)
* `findIndex`: finds the index of the first element in the array that matches a certain condition (`e => e.username === 'lts'`)
* `some`: checks if at least one element in the array matches a certain condition (`e => e.username === 'lts'`)

The preparation code creates an array with 7500 elements, where each element has a `username` property. The array is populated with two types of data: five elements with `username == 'as'` and one element with `username == 'lts'`.

**Options Compared**

These three test cases compare the performance of different approaches to achieve the same result:

1. **Array.prototype.find()**: finds an element in the array that matches a certain condition.
2. **Array.prototype.findIndex()**: finds the index of the first element in the array that matches a certain condition.
3. **Array.prototype.some()**: checks if at least one element in the array matches a certain condition.

**Pros and Cons**

Here are some pros and cons for each approach:

* `find()`:
	+ Pros: simple, straightforward, and well-documented.
	+ Cons: may return `undefined` if no element is found, which can lead to errors.
* `findIndex()`:
	+ Pros: returns an index, making it easy to work with the matched element, and avoids returning `undefined`.
	+ Cons: returns -1 if no element is found, which might not be what you expect.
* `some()`:
	+ Pros: simple and concise, and returns a boolean value indicating whether at least one element matches.
	+ Cons: may have performance issues for large arrays, as it iterates over the entire array.

**Library/Functionality**

None of these functions rely on external libraries. They are built-in methods of the Array prototype in JavaScript.

**Special JS Features/Syntax**

There are no special features or syntax used in this benchmarking setup. The tests only use standard JavaScript and its built-in data structures.

**Other Alternatives**

If you need to perform similar operations, here are some alternative approaches:

* Using `Array.prototype.forEach()`: iterate over the array using a callback function.
* Using a custom loop: iterate over the array manually using a loop.
* Using other methods like `Array.prototype.includes()`, `Array.prototype.reduce()`, or `Array.prototype.every()` may also be applicable, depending on your specific use case.

In summary, this benchmarking setup provides a simple and straightforward way to compare the performance of three common JavaScript functions: `find()`, `findIndex()`, and `some()`.

Related benchmarks:

find vs findIndex vs some (version: 0)

Comparing performance of: find vs findIndex vs some

Created: 4 years ago by: Guest

Jump to the latest result

find

findIndex

some

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):