Benchmark: teste2 - MeasureThat.net

HTML Preparation code:

<div><div class="teste" id="teste1">asfasdfafd</div></div>

Tests:

teste getElementsByClassName
document.getElementsByClassName(".teste")
getElementById
document.getElementById('teste1');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
teste getElementsByClassName
getElementById

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Context**

MeasureThat.net is a platform that allows users to create and run JavaScript microbenchmarks, which are small programs designed to measure the performance of specific JavaScript features or libraries.

**Benchmark Definition**

The benchmark definition is represented by two JSON objects:

1. **Overall Benchmark Definition**: `{
   "Name": "teste2",
   "Description": "testeset2",
   "Script Preparation Code": null,
   "Html Preparation Code": "<div><div class=\"teste\" id=\"teste1\">asfasdfafd</div></div>"
}`
   This object defines the overall benchmark, including its name, description, and preparation code. The preparation code is empty in this case, which means that no specific setup or initialization is required before running the test.

2. **Individual Test Cases**: `[
    {
        "Benchmark Definition": "document.getElementsByClassName(\".teste\")",
        "Test Name": "teste getElementsByClassName"
    },
    {
        "Benchmark Definition": "document.getElementById('teste1');",
        "Test Name": "getElementById"
    }
]`
   This array contains two individual test cases, each with its own benchmark definition and a unique test name. The first test case uses `getElementsByClassName` to retrieve elements with the class `.teste`, while the second test case uses `getElementById` to retrieve an element by its ID.

**Library and Features**

In this benchmark, we can see that the `document.getElementsByClassName` function is used in one of the test cases. This function returns a live HTMLCollection representing all elements with the specified class name.

*   The `document.getElementById` function is used in another test case. It returns a Node object representing the element whose id and prefix match the one provided as an argument.

**Options Compared**

The two options being compared are:

1.  `getElementsByClassName`
2.  `getElementById`

These functions serve different purposes and have different use cases. `getElementsByClassName` is used to retrieve multiple elements with a specific class name, while `getElementById` is used to retrieve a single element by its ID.

**Pros and Cons**

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

*   `getElementsByClassName`
    *   Pros:
        *   Returns all elements matching the specified class name.
        *   Can be more efficient than using multiple `getElementById` calls if you need to retrieve multiple elements with different IDs.
    *   Cons:
        *   May return an empty NodeList if no element matches the class name.
        *   Can be slower for very large HTML documents due to the overhead of searching through all elements.
*   `getElementById`
    *   Pros:
        *   Returns a single, unique element matching the specified ID.
        *   Typically faster than using `getElementsByClassName` because it only searches through one element.
    *   Cons:
        *   Returns null if no element matches the ID.

**Device Platform and Operating System**

In this benchmark, we can see that the test results are from a Chrome browser running on a Mac OS X 10.15.7 device platform.

**Other Alternatives**

If you were to implement these functions yourself or use them in a different context, here are some other alternatives to consider:

*   For retrieving elements with a specific class name: `querySelector` and `querySelectorAll`
    *   `querySelector`: Returns the first element matching the specified CSS selector.
    *   `querySelectorAll`: Returns all elements matching the specified CSS selector.
*   For retrieving elements by ID: `document.getElementById`
    *   This function is already mentioned in the benchmark, but it's worth noting that there are other ways to retrieve elements using CSS selectors or JavaScript methods.

In conclusion, this benchmark tests the performance of two fundamental JavaScript functions for retrieving elements from an HTML document. Understanding the pros and cons of each function can help you choose the most efficient approach for your specific use case.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser/OS: Chrome 116 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
teste getElementsByClassName	3528841.5 Ops/sec
getElementById	4155464.2 Ops/sec

Related benchmarks:

teste2 (version: 0)

testeset2

Comparing performance of: teste getElementsByClassName vs getElementById

Created: one year ago by: Guest

Jump to the latest result

teste getElementsByClassName

getElementById

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):