Benchmark: Some vs. Filter vs. indexOf vs findIndex

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.findIndex
var tempResult = !!Math.round(Math.random()) ? hasZero.findIndex(v => v === 0) > -1 : withoutZero.findIndex(v => v === 0) > -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.some	182203.0 Ops/sec
Array.filter	92714.4 Ops/sec
Array.indexOf	74360560.0 Ops/sec
Array.findIndex	189948.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Purpose**

The provided JSON represents a benchmark test on measuring the performance of three different approaches for finding the presence of a specific value in an array: `some()`, `filter()`, and `indexOf()`/`findIndex()`. The benchmark test is designed to compare the execution speed of these three approaches, which are essential methods in JavaScript.

**Options Compared**

The options being compared are:

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

**Pros and Cons**

Here's a brief overview of each approach:

*   **Array.some()**: Pros:
    *   Simple to implement
    *   Efficient for small arrays
    Cons:
    *   Creates a new array (not suitable for large datasets)
    *   May be slower than other approaches for very large arrays due to the iteration and testing process.
*   **Array.filter()**: Pros:
    *   Creates a new array with filtered elements
    *   Can be faster than `some()` for large datasets as it avoids unnecessary iterations
Cons:
    *   Creates a new array, which can be memory-intensive
    *   May slow down performance due to the creation of an additional array.
*   **Array.indexOf()** and **Array.findIndex()**: Pros:
    *   Fastest approach among the three, as they directly search for the value in the array
    Cons:
    *   May not be suitable for arrays that contain non-numeric values or values with different data types

**Library and Syntax**

The benchmark test uses native JavaScript methods. No external libraries are required.

**Special JS Features/Syntax**

None mentioned in this specific benchmark definition, but it's essential to note that some JavaScript features like `async/await`, `Promise` handling, or modern syntax (e.g., arrow functions) can impact performance and should be considered when writing benchmarks.

**Alternative Approaches**

If you need alternative approaches for finding a value in an array, consider the following:

*   **Linear search**: Iterating through each element in the array to find the target value.
*   **Binary search**: Suitable for sorted arrays. Divide the search space in half at each step until the target value is found.

When writing benchmarks, remember to:

*   Keep your benchmark test independent of external factors like network speed or environment configuration.
*   Focus on a specific use case and measure performance accordingly.
*   Use meaningful metrics, such as execution time per unit (e.g., milliseconds per iteration).
*   Test for performance in different scenarios, considering edge cases and realistic inputs.

These considerations will help you create more accurate and reliable benchmark results.

Related benchmarks:

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

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.indexOf

Array.findIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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