Benchmark: Test47 - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

var container = document.getElementById("container");
for(var i = 0; i < 5000; i++) {
  var div = document.createElement("div");
  div.className = "div"
  container.appendChild(div);
}

Tests:

1
container.getElementsByClassName("div");
2
container.querySelectorAll(".div");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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 benchmark and explain what's being tested.

**Benchmark Overview**

The test is comparing the performance of two DOM querying methods: `getElementsByClassName` and `querySelectorAll`. Both methods are used to select elements with a specific class name or selector, respectively.

**What's Being Tested?**

In this benchmark, we have three key variables that are being compared:

1. **Browser**: The browser being used for the test (in this case, Chrome 53).
2. **DevicePlatform**: The device platform being tested (Other, indicating a non-mobile device).
3. **ExecutionsPerSecond**: The number of times each method is executed per second.

**Options Compared**

The two options being compared are:

1. `getElementsByClassName`
2. `querySelectorAll`

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

* **`getElementsByClassName`**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: Can return multiple elements if there are multiple matches, which can lead to slower performance due to more DOM manipulations.
* **`querySelectorAll`**:
	+ Pros: More flexible and powerful than `getElementsByClassName`, as it allows for more complex selectors.
	+ Cons: Can be slower due to the overhead of parsing the selector and creating a DocumentFragment.

**Library and Its Purpose**

Neither method requires any external libraries. They are built-in DOM querying methods in JavaScript.

**Special JS Feature or Syntax**

There's no special JS feature or syntax being used in this benchmark. It's purely focused on comparing the performance of two standard DOM querying methods.

**Other Alternatives**

If you're looking for alternative approaches to DOM querying, consider:

* **`querySelector`**: Similar to `querySelectorAll`, but it only returns the first match.
* **`querySelectorAll` with a predicate function**: Allows for more complex filtering and sorting of elements.
* **`document.querySelectorAll` with a CSS selector**: Can be used to select elements based on CSS rules.

In summary, this benchmark is testing the performance difference between `getElementsByClassName` and `querySelectorAll`, two commonly used DOM querying methods in JavaScript.

Related benchmarks:

Test47 (version: 0)

Comparing performance of: 1 vs 2

Created: 9 years ago by: Guest

Jump to the latest result

1

2

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):