Benchmark: find vs findindex

Script Preparation code:

var arr = []
for(let i = 0; i< 1e5; i++)
  arr.push({a: 'asd', b: 1, id: i})

Tests:

find
const result = arr.find(e => e.id == Math.random()*1e5)
findindex
const result = arr.findIndex(e => e.id == Math.random()*1e5)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
findindex

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition json contains information about two test cases: `find` and `findIndex`. The script preparation code creates an array of 100,000 objects with unique IDs. This array serves as the input for both tests.

**Options Compared**

Two options are being compared:

1. **`arr.find(e => e.id == Math.random()*1e5)`**: This is a method call that uses the `find` method to search for an object in the array whose `id` property matches a randomly generated number between 0 and 100,000.
2. **`arr.findIndex(e => e.id == Math.random()*1e5)`**: This is a method call that uses the `findIndex` method to find the index of an object in the array whose `id` property matches a randomly generated number between 0 and 100,000.

**Pros and Cons**

Both methods are used for similar purposes: finding an element in an array based on a condition. However, there are some differences:

*   **Performance**: `findIndex` is generally faster than `find`. This is because `findIndex` returns the index of the found element, whereas `find` returns the found element itself. This allows `findIndex` to avoid unnecessary iterations.
*   **Null Returns**: If no elements match the condition in both `find` and `findIndex`, they will return `undefined`. However, if an empty array is passed as a parameter to either method, they may return different values.
*   **Readability and Usage**: `find` is often preferred for its simplicity and readability. It clearly conveys that it finds the first element in the array based on the condition. On the other hand, `findIndex` provides an index-based solution which can be useful in certain scenarios.

**Library Used**

Neither of these methods uses a library explicitly in this benchmark definition; they are built-in JavaScript methods.

**Special JS Feature/Syntax**

This benchmark does not use any special JavaScript features or syntax. It only utilizes the standard `find`, `findIndex`, and array operations.

**Alternative Approaches**

Some alternative approaches to compare include:

*   **Regular Expressions**: You can write a regular expression-based solution for this problem, but it will likely be slower than using built-in methods like `find` or `findIndex`.
*   **Loops**: You could use explicit loops (e.g., `for` loop) and array indices to achieve the same result as `findIndex`. However, this approach is generally less efficient.
*   **Native Array Functions from Other Languages**: If you're using a polyfill for older browsers or want to compare performance across different languages, you can use equivalent functions in other languages like Python's `any` function or Java 8's `Stream` API.

In conclusion, the provided benchmark compares two built-in JavaScript methods: `find` and `findIndex`. While both provide similar functionality, they differ in terms of performance, null return values, readability, and usage. The choice between these methods often depends on the specific use case or personal preference.

Related benchmarks:

find vs findindex (version: 0)

Comparing performance of: find vs findindex

Created: 3 years ago by: Guest

Jump to the latest result

find

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):