Benchmark: !!find vs findIndex != -1

Script Preparation code:

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

Tests:

Array.prototype.find
const found = !!arr.find(item => item == 1E5);
Array.prototype.findIndex
const found = arr.findIndex(item => item == 1E5) != -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.find
Array.prototype.findIndex

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON benchmark definition and test cases.

**Benchmark Definition**

The benchmark is designed to compare two approaches for searching an array in JavaScript: `find` vs `findIndex`. The `find` method returns the first element of an array that satisfies a specified condition, while the `findIndex` method returns the index of the first element that satisfies a specified condition. If no such element exists, `find` returns `undefined`, whereas `findIndex` returns `-1`.

**Script Preparation Code**

The script preparation code creates an empty array and iterates over it 100,000 times, assigning each iteration number to the corresponding index in the array.

```javascript
var arr = [];
var i = 0;

while (i <= 1E5) {
    arr[i] = i++;
}
```

This step is necessary because both `find` and `findIndex` are searching for a specific value within the array, and having a large array with consecutive numbers helps to create a scenario that's representative of real-world use cases.

**Html Preparation Code**

There is no HTML preparation code provided, which means the benchmark is purely run in JavaScript without any overhead from an HTML page.

**Individual Test Cases**

There are two test cases:

1. `Array.prototype.find`: This test case uses the `find` method to search for a specific value within the array.
2. `Array.prototype.findIndex`: This test case uses the `findIndex` method to search for a specific value within the array.

Now, let's discuss the pros and cons of each approach:

**Find Method**

Pros:

* Simpler code: The `find` method is generally easier to read and understand than the `findIndex` method.
* More intuitive: Some developers might find it more natural to use `find` when searching for a specific value.

Cons:

* Returns `undefined`: If no element satisfies the condition, `find` returns `undefined`, which can be unexpected behavior in some cases.
* May incur additional overhead due to optional chaining (`?.`): In modern JavaScript (ES6+), the `find` method has an optional chaining feature that allows you to chain methods after finding a value. However, this adds extra overhead and might not always be desirable.

**FindIndex Method**

Pros:

* Returns `-1`: If no element satisfies the condition, `findIndex` returns `-1`, which is clearly understood behavior.
* Typically more efficient: `findIndex` can be faster than `find` for large arrays since it only needs to find the index of the first matching value.

Cons:

* More complex code: The `findIndex` method is generally more verbose and harder to read than the `find` method.
* Less intuitive: Some developers might find it less natural to use `findIndex` when searching for a specific value.

**Other Considerations**

One important consideration is that both methods are case-sensitive, so if you're searching for values with different casing (e.g., "1E5" vs. "1e5"), the results will be different due to how JavaScript handles string comparison.

As for special JS features or syntax, there's no mention of any specific features in this benchmark definition. However, it's worth noting that modern JavaScript versions (ES6+) have introduced several features, such as `const` and `let`, that might impact the performance of these methods.

**Alternatives**

If you're interested in exploring other approaches for searching arrays, here are a few alternatives:

1. **Array.prototype.some**: This method returns `true` if at least one element satisfies a specified condition.
2. **Array.prototype.every**: This method returns `true` if all elements satisfy a specified condition.
3. **Regular expressions**: You can use regular expressions to search for values within an array, but this approach is typically slower and more memory-intensive.

In summary, the choice between using `find` or `findIndex` depends on your specific use case and performance requirements. While `find` might be a better fit when you need to return the actual value that satisfies the condition, `findIndex` is often faster and more efficient for finding the index of the first matching value.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36

Browser/OS: Chrome 97 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.find	699.6 Ops/sec
Array.prototype.findIndex	702.8 Ops/sec

Related benchmarks:

!!find vs findIndex != -1 (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.find vs Array.prototype.findIndex

Created: 2 years ago by: Guest

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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