Benchmark: JS Some vs JS findIndex

Script Preparation code:

var array = Array.from(Array(10000).keys())

Tests:

JS Some
const found = array.some(s => s === 433);
JS findIndex
const found = array.findIndex(s => s === 433) > -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JS Some
JS findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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Let's dive into the world of JavaScript microbenchmarks and understand what's being tested on MeasureThat.net.

**Benchmark Definition JSON**

The provided Benchmark Definition JSON defines two test cases:

1. **JS Some**: This test case uses the `some()` method to check if at least one element in an array satisfies a condition.
2. **JS findIndex**: This test case uses the `findIndex()` method to find the index of the first element in an array that satisfies a condition.

**Script Preparation Code**

The script preparation code generates an array of 10,000 elements using `Array.from()`, which creates a new array by iterating over another iterable (in this case, an array of numbers from 0 to 9,999).

**Html Preparation Code**

There is no HTML preparation code provided in the JSON.

**Options Compared**

In both test cases, the same underlying logic is used:

* The condition `s === 433` or `s > -1` checks if a specific value (433) exists in the array.
* Both methods iterate over the array to perform the check.

However, there are differences in how these operations are executed:

* **JS Some**: This method returns `true` as soon as it finds an element that satisfies the condition. If no such element is found, it returns `false`. In contrast:
* **JS findIndex**: This method returns the index of the first element that satisfies the condition, or -1 if no such element exists.

**Pros and Cons**

Here's a brief analysis of each approach:

**JS Some**:

Pros:

* Can stop iterating over the array as soon as it finds an element that satisfies the condition.
* May be faster for small arrays or when only one result is expected.

Cons:

* Requires checking every element in the array to find any match, which can lead to slower performance for large arrays.

**JS findIndex**:

Pros:

* Can return the index of the first matching element without having to iterate over all elements.
* May be faster for larger arrays or when multiple results are expected.

Cons:

* Returns -1 if no element satisfies the condition, requiring additional checks or handling.
* Requires iterating over the array until finding an element that meets the condition.

**Other Considerations**

It's worth noting that the choice between `some()` and `findIndex()` often depends on the specific use case. For example, when only one result is expected, `some()` might be a better choice. However, if multiple results are needed or performance is critical for large arrays, `findIndex()` might be more suitable.

**Libraries and Special JS Features**

There is no explicit library mentioned in the Benchmark Definition JSON. However, it's worth noting that `Array.prototype.some()` and `Array.prototype.findIndex()` are part of the JavaScript standard library.

**Special JS Feature**

The use of arrow functions (`s => s === 433`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). Arrow functions provide a concise syntax for creating small, single-expression functions. They can be used as arguments to methods like `some()` and `findIndex()`.

Related benchmarks:

JS Some vs JS findIndex (version: 0)

Comparing performance of: JS Some vs JS findIndex

Created: 6 years ago by: Guest

Jump to the latest result

JS Some

JS findIndex

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):