Benchmark: Teste for vs foreach

Tests:

For
itemList = [0,1,2,3,4,5,6,7,8,9]; for(let index= 0; index<itemList.legth; index++){ const count = itemList[index]; };
Foreach
itemList = [0,1,2,3,4,5,6,7,8,9]; itemList.forEach(item => { const count = item; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For
Foreach

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance difference between using traditional `for` loops and the `forEach` method in JavaScript for iterating over arrays.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. **"For"`: This test case uses a traditional `for` loop to iterate over an array, where each iteration assigns the value at the current index to a variable called `count`.
2. **"Foreach"`: This test case uses the `forEach` method to iterate over the same array, where each iteration also assigns the value of each item to a variable called `count`.

**Options Compared**

The benchmark compares two options:

1. Traditional `for` loop
2. `forEach` method

**Pros and Cons of Each Approach**

* **Traditional `for` loop**:
	+ Pros:
		- More control over iteration, allowing for early termination or skipping certain elements.
		- Can be more efficient in terms of memory usage, as it doesn't require creating a separate context object like `forEach` does.
	+ Cons:
		- More verbose and error-prone code.
		- Can lead to off-by-one errors if not used carefully.
* **`forEach` method**:
	+ Pros:
		- Concise and readable code, making it easier to write and maintain.
		- Automatic handling of array bounds checking and null/undefined values.
	+ Cons:
		- Less control over iteration, as the callback function is executed for each element in the array.
		- May be slower due to the overhead of creating a separate context object.

**Library Usage**

None of the test cases explicitly use any libraries. However, it's worth noting that the `forEach` method is a built-in part of the JavaScript standard library since ECMAScript 5 (ES5).

**Special JS Feature/Syntax**

There are no special features or syntaxes used in this benchmark.

**Other Alternatives**

If you want to compare other iteration methods, such as:

* Array.prototype.reduce(): This method applies a function against an accumulator and each element of the array (from left-to-right) to reduce it to a single value.
* Array.prototype.map(): This method creates a new array with the results of applying a provided function on every element in this array.

You would need to add additional test cases to measure their performance.

I hope this explanation helps!

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0

Browser/OS: Firefox 79 on Ubuntu

View result in a separate tab

Test name	Executions per second
For	15458005.0 Ops/sec
Foreach	10651310.0 Ops/sec

Related benchmarks:

Teste for vs foreach (version: 0)

Comparing performance of: For vs Foreach

Created: 4 years ago by: Guest

Jump to the latest result

For

Foreach

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):