Benchmark: findIndex vs for-of

Tests:

for-of
const array = [1, 4, 6, 7]; let found; for (const item of array) { if (item === 6) { found = item; break; } }
findIndex
const array = [1, 4, 6, 7]; let found; const index = array.findIndex(item => item === 6); if (index !== -1) { found = array[index]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-of
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):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The test compares two approaches to find an element in an array: the traditional `for...of` loop and the `findIndex` method.

**Script Preparation Code**

There is no script preparation code provided, which means that the test starts with a clean slate. The benchmark will run multiple iterations of each approach without any initialization or setup.

**Individual Test Cases**

There are two test cases:

1. **"for-of"**: This test case uses an array of integers and iterates over it using a `for...of` loop. It finds the first element that matches a specific condition (in this case, 6) and breaks out of the loop when found.
2. **"findIndex"**: This test case also uses an array of integers but employs the `findIndex` method to find the index of the first element that matches a specific condition (in this case, 6). It then accesses the element at that index.

**Library and Special JS Features**

In both test cases, there is no explicit mention of any libraries or special JavaScript features. However, it's worth noting that `findIndex` is a built-in method in modern JavaScript, introduced in ECMAScript 2012 (ES6).

**Approach Comparison**

Here are the pros and cons of each approach:

* **"for...of" Loop**:
	+ Pros: Simple to implement, easy to understand, and can be used for both iterating over arrays and objects.
	+ Cons: Can be slower than other methods due to its nature (iterating over elements).
* **"findIndex" Method**:
	+ Pros: Fast, efficient, and easy to use. It's also a built-in method, making it widely supported.
	+ Cons: May not work as expected for arrays with NaN or non-numeric values.

**Other Alternatives**

For finding an element in an array, other alternatives could be:

* Using `forEach` with the callback function
* Using `every` and `some` methods (although these might not be suitable for this specific use case)
* Implementing a custom search algorithm using binary search or other optimization techniques

**Benchmark Considerations**

When interpreting benchmark results like these, it's essential to consider factors such as:

* Browser version and platform
* Array size and data distribution
* Number of iterations performed by each test case
* Compiler optimizations (if applicable)

Keep in mind that microbenchmarks can be fragile due to the many factors involved. Results may vary depending on specific test conditions.

In this benchmark, both approaches have their strengths and weaknesses, but `findIndex` seems to offer better performance. However, it's always essential to understand the context and consider other aspects before drawing conclusions about the suitability of each approach for a specific use case.

Related benchmarks:

findIndex vs for-of (version: 0)

Comparing performance of: for-of vs findIndex

Created: 7 years ago by: Guest

Jump to the latest result

for-of

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):