Benchmark: Javacript Arrays: Find vs FindIndex vs Some

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

Element
const item = arr.find(item => item == 1E5);
Index Of
const index = arr.findIndex(item => item == 1E5);
Exists
const some = arr.some(item => item == 1E5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Element
Index Of
Exists

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.79 Safari/537.36

Browser/OS: Chrome 100 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Element	1029.3 Ops/sec
Index Of	1024.4 Ops/sec
Exists	973.6 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 benchmark and explain what's being tested.

**Benchmark Purpose**

The benchmark is designed to compare the performance of three different array prototype methods in JavaScript: `find`, `findIndex`, and `some`. The goal is to determine which method is the fastest for finding a specific element or determining if an element exists in the array.

**Options Compared**

The three options being compared are:

1. **`find`**: Returns the first element of the array that satisfies the provided condition. If no elements satisfy the condition, it returns `undefined`.
2. **`findIndex`**: Returns the index of the first element of the array that satisfies the provided condition. If no elements satisfy the condition, it returns `-1`.
3. **`some`**: Returns a boolean value indicating whether at least one element in the array satisfies the provided condition.

**Pros and Cons**

*   **`find`**: Pros:
    *   Easy to read and understand.
    *   Simple implementation.
    Cons:
    *   Can be slower for large arrays since it returns `undefined` if no elements satisfy the condition, which can lead to unnecessary work in the caller code.
*   **`findIndex`**:
    *   Pros:
        *   Returns an index, which can be useful for further processing or iteration.
        *   Faster than `find` because it doesn't need to create a new array element if no elements satisfy the condition.
    *   Cons:
        *   Not as intuitive as `find`.
*   **`some`**:
    *   Pros:
        *   Fast and efficient, as it can short-circuit once it finds an element that satisfies the condition.
        *   Returns a boolean value immediately, which can be beneficial for performance in certain scenarios.
    *   Cons:
        *   Not as straightforward as `find` or `findIndex`.

**Library Usage**

None of the benchmarked methods use any external libraries. The comparison is purely based on the built-in JavaScript array prototype methods.

**Special JS Features**

There are no special JavaScript features being tested in this benchmark, aside from the standard array methods and some basic arithmetic operations (e.g., `1E5` for a large number).

**Other Alternatives**

Some alternative approaches to these methods could include:

*   **Linear search**: Iterating through the entire array using an index variable until finding the target element.
*   **Binary search**: A more efficient approach for sorted arrays, but it's not applicable in this case since the benchmark doesn't specify a sorted array.

These alternatives are generally less efficient than the built-in `find`, `findIndex`, and `some` methods, which are optimized for performance.

Related benchmarks:

Javacript Arrays: Find vs FindIndex vs Some (version: 0)

Comparing Arrary prototype methods

Comparing performance of: Element vs Index Of vs Exists

Created: 3 years ago by: Registered User

Jump to the latest result

Element

Index Of

Exists

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):