Benchmark: For, While - MeasureThat.net

HTML Preparation code:

<div id="container"></div>

Script Preparation code:

var node = document.getElementById('container');
for(var i = 0; i < 1000; i++) node.appendChild(document.createElement('div'));

Tests:

For
var items = document.querySelectorAll('#container > div'); let i = 0; for (;items[i];) { i++; }
While
var items = document.querySelectorAll('#container > div'); let i = 0; while (items[i]) { i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For
While

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 and explain what's being tested.

**Benchmark Definition**

The benchmark is defined by two JavaScript scripts:

1. **Script Preparation Code**: This code creates an HTML container element with 1000 child elements (`div` elements). The `var node = document.getElementById('container');` line retrieves the container element, and then we create a loop to append 1000 new `div` elements to it.
2. **Html Preparation Code**: This is simply a basic HTML structure with an empty container element.

The benchmark's goal is to measure the performance of two different loops: a traditional `for` loop and a `while` loop, both applied to a querySelector result (`items`).

**Comparison Options**

There are two comparison options:

1. **For Loop**: The first test case uses a traditional `for` loop with an index variable `i`. This loop increments the index until it reaches the end of the array.
2. **While Loop**: The second test case uses a `while` loop that iterates over the querySelector result (`items`) as long as its value is truthy.

**Pros and Cons**

1. **For Loop**:
	* Pros: Easy to understand, predictable behavior, and often more efficient due to optimized compiler optimizations.
	* Cons: Less flexible, may not work with large arrays or sparse data, can be slower for small arrays.
2. **While Loop**:
	* Pros: More flexible, works well with large arrays or sparse data, can be faster for small arrays.
	* Cons: May have unexpected behavior if the condition is not properly checked, less predictable than `for` loops.

In this benchmark, the results show that the `while` loop performs slightly better on Chrome 107 on a desktop device. However, it's essential to note that these results may vary depending on the specific use case and environment.

**Library Usage**

There is no library used in these test cases.

**Special JS Features or Syntax**

The benchmark uses:

1. **QuerySelector**: This feature allows selecting elements using CSS selectors.
2. **Semi-colons (`;`)**: Used to separate statements in JavaScript code.

Keep in mind that some features, like querySelector, are specific to modern browsers and may not be supported by older browsers or environments.

**Other Alternatives**

For similar benchmarks, you can consider alternatives such as:

1. Using `Array.prototype.forEach()` instead of `for` loops.
2. Implementing a custom iterator using `Set` or other data structures.
3. Comparing the performance of different loop optimization techniques, such as using `while` loops with early termination conditions.

These alternatives would require modifications to the benchmark definition and test cases to accommodate the new scenarios.

Related benchmarks:

For, While (version: 0)

Comparing performance of: For vs While

Created: 3 years ago by: Guest

Jump to the latest result

For

While

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):