Benchmark: find vs findIndex vs some (fork)

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);
Array.prototype.findIndex
const index = arr.findIndex(item => item == 1E5);
Array.prototype.some
const hasItem = arr.some(item => item == 1E5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.find
Array.prototype.findIndex
Array.prototype.some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.find	934.1 Ops/sec
Array.prototype.findIndex	730.5 Ops/sec
Array.prototype.some	990.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark, titled "find vs findIndex vs some (fork)", measures which method is faster: `Array.prototype.find`, `Array.prototype.findIndex`, or `Array.prototype.some`. The test case uses a custom array `arr` generated by the script preparation code, which populates it with integers from 0 to 100,000.

**Methods Compared**

The three methods being compared are:

1. **`Array.prototype.find()`**: Returns the first element in the array that satisfies the provided condition (in this case, finding an element equal to 100,000).
2. **`Array.prototype.findIndex()`**: Returns the index of the first element in the array that satisfies the provided condition (in this case, finding an element equal to 100,000). If no such element exists, returns -1.
3. **`Array.prototype.some()`**: Returns a boolean indicating whether at least one element in the array satisfies the provided condition (in this case, checking if any element is equal to 100,000).

**Pros and Cons of Each Approach**

1. **`Array.prototype.find()`**:
	* Pros: Returns a single value if found, which can be useful for further processing.
	* Cons: May not be as efficient as other methods for large arrays, as it iterates through the entire array to find the first match.
2. **`Array.prototype.findIndex()`**:
	* Pros: Returns an index, making it suitable for accessing elements in the original array or using with `map()` and other methods.
	* Cons: May be slower than `some()` if no element is found, as it still iterates through the entire array.
3. **`Array.prototype.some()`**:
	* Pros: More efficient than `find()` and `indexOf()` for large arrays, as it stops iterating as soon as a match is found.
	* Cons: Returns a boolean value instead of a specific element or index.

**Library/Utility**

None explicitly mentioned in the provided benchmark code. However, some JavaScript engines and libraries might optimize or provide additional features for these array methods.

**Special JS Features/Syntax (None)**

No special JavaScript features or syntax are used in this benchmark that would require explanation beyond the method comparisons themselves.

**Other Alternatives**

For measuring performance differences between array methods:

1. **`Array.prototype.indexOf()`**: Similar to `findIndex()`, but returns -1 if no element is found.
2. **`Array.prototype.includes()`**: A modern alternative to `indexOf()`, which is more efficient and widely supported across browsers.

Keep in mind that the specific performance differences between these methods may vary depending on the JavaScript engine, browser, and array size.

Related benchmarks:

find vs findIndex vs some (fork) (version: 0)

Measuring which is faster

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

Created: 2 years ago by: Guest

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

Array.prototype.some

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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