Benchmark: get root - MeasureThat.net

HTML Preparation code:

<div id="root">

Tests:

query
document.querySelector("#root")
by id
document.getElementById("root")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
query
by id

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 what is being tested on the provided JSON benchmark and explain the different approaches, pros, cons, and considerations.

**Benchmark Definition**

The benchmark definition is represented by two JSON objects:

1. `Name`: "get root"
2. `Description`: null
3. `Script Preparation Code`: null
4. `Html Preparation Code`: "<div id=\"root\">"

This suggests that the benchmark measures how fast JavaScript can retrieve an element from a DOM tree, specifically in this case, using the `document.querySelector()` or `document.getElementById()` method.

**Options being compared**

The two individual test cases compare different approaches to achieve this:

1. **`query`**: Uses `document.querySelector("#root")`
2. **`by id`**: Uses `document.getElementById("root")`

**Pros and Cons of each approach:**

1. **`query`**: Uses the query selector API, which is a more flexible and powerful way to select elements in modern browsers.
	* Pros:
		+ Can select multiple elements at once using a comma-separated list (e.g., `#root .class`, `#root > div`)
		+ Can use CSS selectors for more complex selection patterns
	* Cons:
		+ May be slower due to the complexity of the selector and potential parsing overhead
2. **`by id`**: Uses the `getElementById()` method, which is a simple and straightforward way to retrieve an element by its ID.
	* Pros:
		+ Fast and efficient, as it only needs to parse the element's ID
	* Cons:
		+ Limited to retrieving elements with a unique ID; multiple elements cannot be retrieved at once

**Library and purpose**

In both test cases, no external library is used. The `document.querySelector()` and `document.getElementById()` methods are part of the standard DOM API.

**Special JavaScript feature or syntax**

None are explicitly mentioned in this benchmark. However, note that the query selector API (used in the `query` test case) was introduced in CSS3 Selectors Level 3 and later adopted by modern browsers as a native API.

**Other alternatives**

If you wanted to use alternative approaches for retrieving elements from a DOM tree, some options could be:

* Using `document.getElementsByTagName()` to retrieve all elements with a specific tag name (e.g., `document.getElementsByTagName("div")`)
* Using `document.querySelectorAll()` to retrieve multiple elements using a CSS selector
* Using a library like jQuery or React to manage DOM updates and retrieval

Keep in mind that each approach has its own trade-offs, and the choice of method depends on the specific use case and performance requirements.

Related benchmarks:

get root (version: 0)

Comparing performance of: query vs by id

Created: 5 years ago by: Guest

Jump to the latest result

query

by id

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):