Benchmark: teafasdfsafaefafa152151414121514124321523561235125124

HTML Preparation code:

<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select><select></select>
<select></select>

<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select><select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select><select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select><select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>
<select></select>

Script Preparation code:

var targetArr = document.querySelectorAll("select");
var optionArr = [
  {CODE_NAME: "one", CODE_ID: 1},
  {CODE_NAME: "two", CODE_ID: 2},
   {CODE_NAME: "one", CODE_ID: 1},
  {CODE_NAME: "two", CODE_ID: 2}, {CODE_NAME: "one", CODE_ID: 1},
  {CODE_NAME: "two", CODE_ID: 2}, {CODE_NAME: "one", CODE_ID: 1},
  
  {CODE_NAME: "two", CODE_ID: 2}, {CODE_NAME: "one", CODE_ID: 1},
  
  
  {CODE_NAME: "two", CODE_ID: 2}
  
];

Tests:

legacy
targetArr.forEach(function(target) { optionArr.forEach(function(item) { var option = document.createElement("option") option.setAttribute("value", item.CODE_ID); option.innerText = item.CODE_NAME; target.append(option); }); });
refactoring
var fragment = document.createDocumentFragment(); optionArr.forEach(function(item) { var option = document.createElement("option"); option.value = item.CODE_ID; option.innerText = item.CODE_NAME; fragment.appendChild(option); }); targetArr.forEach(function(target) { target.appendChild(fragment.cloneNode(true)); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
legacy
refactoring

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.

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

**Benchmark Definition**

The benchmark is testing the performance of two approaches for populating HTML select elements with options:

1. **Legacy Approach**: The `forEach` method is used to iterate over the target elements (`targetArr`) and append options created from the `optionArr` array.
2. **Refactoring Approach**: A document fragment (`fragment`) is created, and options are appended to it using `appendChild`. Then, the fragment is cloned and appended to each target element.

**Options Compared**

The two approaches are being compared:

* **Legacy Approach**:
	+ Uses `forEach` method on `targetArr`
	+ Creates options dynamically by setting attributes (`value`, `innerText`) on elements created with `document.createElement`
	+ Appends options to target elements
* **Refactoring Approach**:
	+ Uses a document fragment (`fragment`)
	+ Creates options in a separate step and appends them to the fragment
	+ Clones the fragment before appending it to each target element

**Pros and Cons**

**Legacy Approach:**

Pros:

* Simple and straightforward implementation
* No additional DOM manipulation beyond creating elements and setting attributes

Cons:

* May lead to performance issues due to repeated DOM mutations (appending, removing, etc.)
* Can be slower due to the overhead of `forEach` method iterations

**Refactoring Approach:**

Pros:

* Reduces DOM mutations by using a document fragment
* Can lead to better performance due to reduced DOM changes
* Separates creation and appending of options, which can improve maintainability

Cons:

* Introduces additional complexity with the use of a document fragment
* Requires more DOM manipulation than the legacy approach (creating and cloning the fragment)

**Other Considerations**

* The benchmark uses Chrome 116 as the browser, which may have specific optimizations or quirks affecting performance.
* The `optionArr` array is large, which can impact performance due to repeated iterations over the array.

**Library Usage**

None of the provided code snippets appear to use any libraries beyond the standard JavaScript DOM APIs. However, it's worth noting that some modern browsers and frameworks may provide additional features or optimizations for certain tasks (e.g., `forEach` method on arrays).

**Special JS Feature or Syntax**

The legacy approach uses the `forEach` method, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). The refactoring approach also uses this method.

**Alternatives**

Other approaches to consider:

* Using `Array.prototype.forEach()` with `map` and `reduce` methods instead of `forEach`
* Utilizing Web Workers or other parallel execution techniques to speed up the benchmark
* Optimizing the HTML structure or using a library like jQuery to simplify DOM manipulation

Keep in mind that these alternatives may introduce additional complexity or trade-offs, and the best approach will depend on the specific requirements and constraints of your project.

Related benchmarks:

teafasdfsafaefafa152151414121514124321523561235125124 (version: 0)

sadfsafsafdsaf

Comparing performance of: legacy vs refactoring

Created: 2 years ago by: Guest

Jump to the latest result

legacy

refactoring

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):