Benchmark: For-of vs While - Random v1.2

Script Preparation code:

var variants = [{ id: 1, weight: 1}, { id: 2, weight: 10 }, { id: 3, weight: 10 }, { id: 4, weight: 10 }, { id: 5, weight: 10 }];
var totalWeight = variants.reduce((sum, item) => sum + item.weight, 0);
var scores = Array.from({ length: 10 }).map(() => { Math.trunc(Math.random() * totalWeight) });

var forofreturn = (score) => {
  for (const variant of variants) {
    if (score < variant.weight) {
       return variant;
     }
     score -= variant.weight;
  }
}

var whileloopindex = (score) => {
  var index = 0;
  while (score > 0) {
    score -= variants[++index].weight;
  }

  return variants[index];
}

Tests:

forofreturn
forofreturn(scores[0]); forofreturn(scores[1]); forofreturn(scores[2]); forofreturn(scores[3]); forofreturn(scores[4]); forofreturn(scores[5]); forofreturn(scores[6]); forofreturn(scores[7]); forofreturn(scores[8]); forofreturn(scores[9]);
whileloopindex
whileloopindex(scores[0]); whileloopindex(scores[1]); whileloopindex(scores[2]); whileloopindex(scores[3]); whileloopindex(scores[4]); whileloopindex(scores[5]); whileloopindex(scores[6]); whileloopindex(scores[7]); whileloopindex(scores[8]); whileloopindex(scores[9]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forofreturn
whileloopindex

Fastest: N/A

Slowest: N/A

Latest 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 definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark measures the performance of two approaches: `for-of` loop and `while` loop with an index variable, on a dataset of 10 random scores generated from a weighted distribution. The weights are defined in the `Script Preparation Code`.

**Script Preparation Code**

The script preparation code defines:

1. An array of variants with their corresponding weights.
2. A total weight calculated by summing up all variant weights.
3. An array of 10 random scores generated by multiplying the total weight with a random number between 0 and 1.

The `for-of` loop (`forofreturn`) function iterates through the variants array, returning the first variant whose weight is less than or equal to the current score. The `while` loop with an index variable (`whileloopindex`) function iterates through the variants array, subtracting each variant's weight from the score and using the index of the remaining score to return the corresponding variant.

**Individual Test Cases**

There are two test cases:

1. `forofreturn(scores[0])`, `forofreturn(scores[1])`, ..., `forofofscores[9]`
This test case measures the performance of the `for-of` loop on each individual score.
2. `whileloopindex(scores[0])`, `whileloopindex(scores[1])`, ..., `whileloopindex(scores[9])`
This test case measures the performance of the `while` loop with an index variable on each individual score.

**Libraries and Features**

None of the provided code uses any external libraries. However, it does utilize a few special JavaScript features:

* The `reduce()` method is used to calculate the total weight.
* The `Array.from()` method is used to generate the array of random scores.
* The `Math.trunc()` function is used to truncate the result of multiplying the total weight with a random number.

**Pros and Cons**

The choice between the two approaches depends on the specific use case. Here are some pros and cons of each approach:

* **For-of Loop**
	+ Pros:
		- More concise and expressive code.
		- Easier to read and maintain.
	+ Cons:
		- May be slower due to the overhead of iterating through the array.
* **While Loop with Index Variable**
	+ Pros:
		- Can be faster for large datasets, as it avoids the overhead of iterating through an array.
	+ Cons:
		- More verbose and less expressive code.
		- Requires manual index management.

**Other Alternatives**

Other alternatives to these two approaches include:

* Using a `forEach()` method instead of a `for-of` loop.
* Using a `do-while` loop instead of a `while` loop with an index variable.
* Using a `for` loop with an iterator object instead of a `for-of` loop.

However, the choice of alternative will depend on the specific requirements and constraints of the use case.

Related benchmarks:

For-of vs While - Random v1.2 (version: 4)

Comparing performance of: forofreturn vs whileloopindex

Created: 7 years ago by: Registered User

Jump to the latest result

forofreturn

whileloopindex

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):