Benchmark: foobar-ccmpcp - MeasureThat.net

HTML Preparation code:

<html>
  <head>
  </head>
  <body>
    <div id=''></div>
  </body>

Tests:

querySelector
document.querySelector('body');
getElementsByTagName
document.getElementsByTagName('body')[0];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
querySelector
getElementsByTagName

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition JSON**

The benchmark definition represents the JavaScript code that will be executed in each test case. In this case, there are two benchmark definitions:

1. `document.querySelector('body');`
2. `document.getElementsByTagName('body')[0];`

These two lines of code perform different tasks:

* `querySelector` uses the `querySelector` method to select an element with a specific selector (`'body'`). This method returns the first matching element or `null` if no elements match.
* `getElementsByTagName` uses the `getElementsByTagName` method to get a live HTMLCollection of all elements with the specified tag name (`'body'`). In this case, since there's only one body element in the HTML document, it returns an array containing only that element.

**Test Cases**

Each test case represents a separate execution of the benchmark definition. The provided test cases are:

1. `querySelector`
2. `getElementsByTagName`

These two test cases will be executed on different browsers and platforms to compare their performance.

**Options Compared**

In this benchmark, two options are being compared:

1. Using `querySelector` vs. using `getElementsByTagName`.
2. Execution per second (as measured by the number of executions) is also being compared.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

* **querySelector**:
	+ Pros: More efficient for selecting a single element, can be more accurate.
	+ Cons: May not work as expected in older browsers or with certain CSS selectors.
* **getElementsByTagName**:
	+ Pros: Works across all browsers, but may return multiple elements if there are multiple body elements.
	+ Cons: Less efficient for selecting a single element, can be slower.

**Library and Purpose**

In this benchmark, the following library is used:

* `document`: This is a part of the DOM (Document Object Model) API in JavaScript. It provides an interface to interact with HTML documents.

There are no additional libraries being used in these benchmark definitions.

**Special JS Features or Syntax**

No special JavaScript features or syntax are being used in these benchmark definitions. They appear to be standard JavaScript code using DOM methods.

**Other Alternatives**

Some alternative approaches could have been used in this benchmark:

* Instead of `querySelector` and `getElementsByTagName`, other methods like `getElementsByClassName` or `getElementById` could have been used.
* Other browsers, like Firefox or Edge, could have been included in the test cases to compare performance across different browsers.

Overall, this benchmark is designed to compare the performance of two DOM methods for selecting an element by name. By using a simple HTML document and executing these methods on multiple platforms, the results provide insight into which method is faster and more efficient.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser/OS: Chrome 73 on Mac OS X 10.14.3

View result in a separate tab

Test name	Executions per second
querySelector	3146195.2 Ops/sec
getElementsByTagName	3001017.8 Ops/sec

Related benchmarks:

foobar-ccmpcp (version: 0)

Comparing performance of: querySelector vs getElementsByTagName

Created: 5 years ago by: Guest

Jump to the latest result

querySelector

getElementsByTagName

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):