Benchmark: Some vs. Filter vs. indexOf vs. Find

Script Preparation code:

var hasZero = [];
var withoutZero = [];
for (var i = 0; i < 10000; i++) {
  hasZero.push(Math.floor(Math.random() * 1000));
  withoutZero.push(Math.floor(Math.random() * 1000) + 1)
}

Tests:

Array.some
var tempResult = !!Math.round(Math.random()) ? hasZero.some(v => v === 0) : withoutZero.some(v => v === 0);
Array.filter
var tempResult = !!Math.round(Math.random()) ? hasZero.filter(v => v === 0) : withoutZero.filter(v => v === 0);
Array.indexOf
var tempResult = !!Math.round(Math.random()) ? hasZero.indexOf(0) > -1 : withoutZero.indexOf(0) > -1;
Array.find
var tempResult = !!Math.round(Math.random()) ? hasZero.find(v => v === 0) : withoutZero.find(v => v === 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
Array.filter
Array.indexOf
Array.find

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

Test name	Executions per second
Array.some	194858.1 Ops/sec
Array.filter	44430.7 Ops/sec
Array.indexOf	1393811.5 Ops/sec
Array.find	191806.9 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

MeasureThat.net is testing the performance of four different methods for filtering or searching through arrays in JavaScript:

1. `Array.some()`: A method that returns `true` if at least one element in the array satisfies the provided condition.
2. `Array.filter()`: A method that creates a new array with all elements that pass the test implemented by the provided function.
3. `Array.indexOf()`: A method that returns the index of the first occurrence of the specified value, or `-1` if it is not found.
4. `Array.find()`: A method that returns the first element in the array that satisfies the provided condition.

**Options compared**

The four methods are being compared to each other:

* `some()` vs. `filter()`: Both methods check for existence of a value, but `some()` stops checking as soon as it finds a match, while `filter()` continues checking until it finds all matches.
* `indexOf()` vs. `find()`: `indexOf()` is an older method that returns the index of the first occurrence, while `find()` returns the element itself.

**Pros and cons**

Here's a brief summary of each method:

* `Array.some()`:
	+ Pros: Efficient for arrays with many elements (stops checking as soon as it finds a match), can be used to check if any element in an array satisfies a condition.
	+ Cons: Can return false positives if the condition is not correctly implemented, may not work well for large arrays due to memory constraints.
* `Array.filter()`:
	+ Pros: Creates a new array with all matching elements, can be used to transform or filter an array without modifying the original one.
	+ Cons: May consume more memory than other methods, especially for large arrays.
* `Array.indexOf()`:
	+ Pros: Returns the index of the first occurrence, simple and efficient implementation.
	+ Cons: Can return `-1` if not found, which may not be desirable in all cases. Also, it's an older method that relies on array indices, which can change behavior with some modern browsers.
* `Array.find()`:
	+ Pros: Returns the element itself, which can simplify code and reduce errors.
	+ Cons: May consume more memory than other methods due to the need to store the found element.

**Library usage**

In this benchmark, no external libraries are being used. The tests only rely on native JavaScript functionality.

**Special JS features or syntax**

None of the test cases use special JavaScript features or syntax that's not widely supported by modern browsers.

**Other alternatives**

If you're looking for alternative methods to check if an element exists in an array, some other options include:

* `Array.includes()`: A more recent method (introduced in ES6) that returns a boolean indicating whether the specified value is present in the array.
* `set` data structure: Creating a set from an array can be faster than using traditional array methods for checking existence.

Keep in mind that performance differences between these alternatives may vary depending on the specific use case and browser implementation.

Related benchmarks:

Some vs. Filter vs. indexOf vs. Find (version: 0)

Comparing performance of: Array.some vs Array.filter vs Array.indexOf vs Array.find

Created: 5 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.indexOf

Array.find

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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