Benchmark: for loop vs Array.some

Script Preparation code:

var array = new Array(1000);
var result = false;

Tests:

for
for (var i = 0; i < array.length; i++) { array[i]; if (i === 877) { result = true; } }
some
array.some(function(i) { return array[i] === 877; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
some

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'll break down the explanation into smaller parts.

**What is being tested?**

The benchmark measures the performance difference between two approaches: using a traditional `for` loop and using the `Array.some()` method to iterate over an array.

**Options compared:**

1. Traditional `for` loop
2. `Array.some()` method

**Pros and cons of each approach:**

1. **Traditional `for` loop:**
	* Pros:
		+ Generally easier to understand and maintain, especially for those familiar with traditional loops.
		+ Can be more predictable in terms of performance and memory usage.
	* Cons:
		+ Can be slower than other approaches due to the overhead of managing an index variable.
		+ May use more memory due to the need to store the index variable.
2. **`Array.some()` method:**
	* Pros:
		+ Typically faster than traditional loops, as it uses a built-in implementation that can take advantage of optimizations like SIMD instructions.
		+ Can be more concise and expressive, making the code easier to read and write.
	* Cons:
		+ May have performance variations depending on the specific browser or JavaScript engine used.
		+ Can be less predictable in terms of performance and memory usage, as it relies on the internal implementation of `Array.some()`.

**Library and its purpose:**

The benchmark does not use any external libraries. However, `Array.some()` is a built-in method in JavaScript that can be thought of as a library function for iterating over an array.

**Special JS feature or syntax:**

There are no special JavaScript features or syntax used in this benchmark. The code is written in standard JavaScript and only uses the `Array` class and basic syntax elements like loops, conditional statements, and variables.

**Other alternatives:**

If you want to explore alternative approaches for iterating over arrays, some common options include:

* Using `for...of` loop (introduced in ECMAScript 2015)
* Using `forEach()` method
* Using `reduce()` method
* Using a custom loop implementation using iterators or generators

It's worth noting that each of these alternatives has its own trade-offs and performance characteristics, which may differ from the traditional `for` loop and `Array.some()` approach.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 10.15.4

View result in a separate tab

Test name	Executions per second
for	4676.2 Ops/sec
some	420012.0 Ops/sec

Related benchmarks:

for loop vs Array.some (version: 0)

Compare loop performance

Comparing performance of: for vs some

Created: 3 years ago by: Guest

Jump to the latest result

for

some

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):