Benchmark: Array.find vs Array.some

Script Preparation code:

window.source = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'];

Tests:

Array.find
const result = !!source.find(target => target === 'f');
Array.some
const result = source.some(target => target === 'f');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
Array.some

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is tested?**

The provided JSON represents a benchmark that compares two options: `Array.find` and `Array.some`. The benchmark tests which method is faster for searching an element in an array using a callback function.

**Options compared**

There are two main approaches being compared:

1. **Array.find**: This method returns the first element in the array that satisfies the provided test. If no elements satisfy the test, it returns `undefined`.
2. **Array.some**: This method returns `true` if at least one element in the array satisfies the provided test. It returns `false` otherwise.

**Pros and Cons of each approach**

1. **Array.find**:
	* Pros:
		+ Returns a specific value (the found element) which can be useful for certain use cases.
		+ Can be more efficient than `Array.some` if only one element needs to be found.
	* Cons:
		+ Returns `undefined` if no elements are found, which may require additional checks.
2. **Array.some**:
	* Pros:
		+ Returns a boolean value (`true` or `false`) indicating whether at least one element matches the test.
		+ Does not return any value when no elements match, avoiding potential null pointer exceptions.
	* Cons:
		+ May be slower than `Array.find` due to the additional iteration needed to check all elements.

**Library and syntax considerations**

There are no libraries mentioned in this benchmark. However, it's worth noting that both `Array.find` and `Array.some` rely on the ECMAScript standard library, which provides a common set of functions for array manipulation.

No special JavaScript features or syntax are used in these benchmarks.

**Other alternatives**

If you need to search an element in an array, you may also consider using:

1. **Array.prototype.indexOf()**: This method returns the index of the first element that satisfies the test. If no elements are found, it returns -1.
2. **Array.prototype.reduce()**: This method applies a reduction function to each element in the array and returns the accumulated result. You can use it to find the first element that matches the test by using `reduce()` with an initial value of -1 or null.

Keep in mind that these alternatives may have different performance characteristics depending on the specific use case and array size.

The benchmark results show that `Array.some` is faster than `Array.find` in this particular scenario, likely due to the shorter execution time required to check all elements in the array.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:107.0) Gecko/20100101 Firefox/107.0

Browser/OS: Firefox 107 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Array.find	26895986.0 Ops/sec
Array.some	48615172.0 Ops/sec

Related benchmarks:

Array.find vs Array.some (version: 0)

Comparing performance of: Array.find vs Array.some

Created: 3 years ago by: Guest

Jump to the latest result

Array.find

Array.some

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):