Benchmark: Elastic find index

Script Preparation code:

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

Tests:

Array.prototype.findIndex
const index = arr.findIndex(item => item === 1E5);
For loop
var index = -1 for(var i = 0; i < arr.length; i++) { if(arr[i] === 1E5) { index = i; break; } }
While loop
var index = -1 var i = 0 while (arr[i] === 1E5) { i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.findIndex
For loop
While loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/117.0

Browser/OS: Firefox 117 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.findIndex	2981.5 Ops/sec
For loop	15282.0 Ops/sec
While loop	1152257664.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided JSON represents a JavaScript benchmark, specifically measuring the performance of three different approaches to find an element in an array:

1. **While loop**: A while loop that increments the index until it finds the desired value (in this case, `1E5`).
2. **For loop**: A for loop that iterates over the array elements using a fixed index.
3. **Array.prototype.findIndex**: The built-in method `findIndex()` of the Array prototype, which returns the index of the first element that satisfies the provided condition.

**Options compared**

The three options are being tested to determine which one is the fastest in terms of execution time.

**Pros and Cons of each approach:**

1. **While loop**:
	* Pros:
		+ Simple and straightforward implementation.
		+ Can be optimized by using a flag variable or breaking out of the loop when the desired value is found.
	* Cons:
		+ May lead to infinite loops if the condition is not properly checked.
		+ Can be slower due to the overhead of incrementing the index.
2. **For loop**:
	* Pros:
		+ More predictable and efficient than while loops for finding a single element.
		+ Less prone to infinite loops since it uses an explicit counter variable.
	* Cons:
		+ May require more memory allocation and deallocation due to the fixed array size.
3. **Array.prototype.findIndex**:
	* Pros:
		+ Highly optimized and implemented in native code, making it generally faster.
		+ Reduces the need for manual loop overhead.
	* Cons:
		+ May not be as intuitive or familiar to developers who are not accustomed to using this method.

**Library/Utility**

None mentioned in the provided JSON.

**Special JavaScript feature/Syntax**

The benchmark uses `1E5` as a literal value, which is an exponential notation (10^5) for 100,000. This is just a specific number used to test the performance of the different approaches and does not imply any special JavaScript feature or syntax.

**Alternative approaches**

Other alternatives to finding an element in an array might include:

* Using `Array.prototype.indexOf()`
* Implementing a custom binary search algorithm
* Using a more advanced data structure, such as a hash table

These alternatives may offer improved performance or efficiency for specific use cases, but they are not explicitly tested in this benchmark.

Related benchmarks:

Elastic find index (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.findIndex vs For loop vs While loop

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.findIndex

For loop

While loop

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):