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;

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Array.indexOf

1.4M/s

Array.some

243K/s

Array.findIndex

211K/s

Array.filter

53K/s

Fastest: Array.indexOf (25.8x faster)

View exact numbers

✓ Array.indexOf: 1,368,856 ops/sec
• Array.some: 243,311 ops/sec
• Array.findIndex: 210,852 ops/sec
• Array.filter: 52,984 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

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 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Linux

View result in a separate tab

Array.indexOf

3.6M/s

Array.findIndex

257K/s

Array.some

251K/s

Array.filter

56K/s

View exact numbers

Test name	Executions per second
✓ Array.indexOf	3,555,828 Ops/sec
Array.findIndex	257,420 Ops/sec
Array.some	251,108 Ops/sec
Array.filter	56,351 Ops/sec

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.

**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.

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

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

Created: 6 years ago by: Guest

Go to the latest result

Array.some

Array.filter

Array.indexOf

Array.findIndex

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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

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

Created: 6 years ago by: Guest

Go to the latest result

Array.some

Array.filter

Array.indexOf

Array.findIndex

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

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