Benchmark: Some vs. indexOf v21

Script Preparation code:

var currencies = ["rub", "usd", "qwe", "www", "zzz", "eur"];
var payments = [{currency: "rub", amount: 99, fee: 88},
                   {currency: "usd", amount: 99, fee: 88},
                   {currency: "peso", amount: 99, fee: 88},
                   {currency: "eur", amount: 99, fee: 88},
                   {currency: "hrk", amount: 99, fee: 88},
                   {currency: "yht", amount: 99, fee: 88},
                   {currency: "kht", amount: 99, fee: 88}];

Tests:

Array.some
var tempResult = payments.filter(payment => currencies.some(elem => elem === payment.currency));
Array.indexOf
var tempResult = payments.filter(x => currencies.indexOf(x.currency) !== -1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
Array.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):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark definition json and individual test cases show that we're testing two different approaches to filter an array in JavaScript: `Array.some` and `Array.indexOf`.

**What is being tested?**

In this case, we're measuring which approach is faster for filtering an array of objects based on the presence of a specific value in another array.

The script preparation code defines two arrays: `currencies` (an array of strings) and `payments` (an array of objects with `currency` property). The test cases use these arrays to filter out payments where the `currency` does not match any value in the `currencies` array.

**Options compared**

We have two options being compared:

1. **Array.some**: This method returns a boolean value indicating whether at least one element of an array passes a given test.
2. **Array.indexOf**: This method returns the index of the first occurrence of a value within a given array, or -1 if it's not found.

**Pros and Cons**

**Array.some**

Pros:

* More concise and readable code
* Can be used with any type of elements in the array

Cons:

* May stop iterating as soon as it finds a match (if you want to iterate over all matches)
* Can be slower than `Array.indexOf` for arrays with many elements, since it uses a loop under the hood

**Array.indexOf**

Pros:

* Faster for large arrays, since it can return immediately when finding a match
* Can be used with primitive values only

Cons:

* Less concise and readable code compared to `Array.some`
* May throw an error if the value is not found in the array

**Other considerations**

In this specific benchmark, we're comparing two common methods for filtering arrays. However, there are other approaches that might also be worth considering, such as:

* Using `Array.prototype.every` instead of `Array.some`, which returns a boolean indicating whether all elements pass a test
* Using a `for...of` loop or `forEach` method to iterate over the array and check for matches
* Using a library like Lodash's `filterBy` function, which can provide additional functionality and optimizations

**Libraries used**

In this benchmark, we're using two libraries:

1. **Built-in JavaScript methods**: `Array.prototype.some`, `Array.prototype.indexOf`
2. None other, since MeasureThat.net only includes the necessary script preparation code.

No special JS features or syntax are being tested in this benchmark.

Related benchmarks:

Some vs. indexOf v21 (version: 0)

Comparing performance of: Array.some vs Array.indexOf

Created: 6 years ago by: Guest

Jump to the latest result

Array.some

Array.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):