Benchmark: For, While - MeasureThat.net

HTML Preparation code:

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

AخA
 
<div id="container"></div>

Script Preparation code:

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

 
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++;
}

 
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++;
}

 
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

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
For
While

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Windows

View result in a separate tab

Test name	Executions per second
For	1639.1 Ops/sec
While	1695.7 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 5 months ago):

Let's break down the provided benchmark and explain what's being tested.

Benchmark Definition

The benchmark is defined by two JavaScript scripts:

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.
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:

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.
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

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.
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:

QuerySelector: This feature allows selecting elements using CSS selectors.
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:

Using Array.prototype.forEach() instead of for loops.
Implementing a custom iterator using Set or other data structures.
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.

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: 2 years ago by: Guest

Jump to the latest result

For