Benchmark: 2x getById vs getById + closest, nested

HTML Preparation code:

<div class="wrapper" id="wrapper">
  <div><div><div>
  <div id="slot"></div>
  </div></div></div>
</div>

Tests:

2x getById
let el1 = document.getElementById('slot'); let el2 = document.getElementById('wrapper');
getById + closest
let el1 = document.getElementById('slot'); let el2 = el1.closest('.wrapper');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
2x getById
getById + closest

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Overview**

The benchmark is testing two approaches to retrieve an element by its ID: using `document.getElementById` twice (e.g., `el1 = document.getElementById('slot'); el2 = document.getElementById('wrapper');`) versus using `closest` method with a CSS selector (`el1 = document.getElementById('slot'); el2 = el1.closest('.wrapper');`). The benchmark is designed to measure the performance difference between these two approaches.

**Options compared**

The two options being compared are:

1. **2x getById**: This approach uses `document.getElementById` twice, once for each element retrieval. This means that the DOM query is performed twice, which can lead to a higher number of DOM manipulations and potential performance issues.
2. **getById + closest**: This approach uses `document.getElementById` once to retrieve the first element (`el1 = document.getElementById('slot');`) and then uses the `closest` method with a CSS selector to find the next closest element that matches the `.wrapper` class (`el2 = el1.closest('.wrapper');`). This approach reduces the number of DOM queries, as the `closest` method can traverse the DOM more efficiently.

**Pros and Cons**

**2x getById**:

Pros: None notable in this context.
Cons:
- Requires two DOM query operations, which can lead to increased DOM manipulations and potential performance issues.
- May result in slower performance due to the additional queries.

**getById + closest**:

Pros:
- Reduces the number of DOM queries by using `closest` method to find the next closest element.
- Can potentially improve performance by reducing unnecessary DOM manipulations.
Cons:
- Requires support for the `closest` method, which may not be supported in older browsers or environments.
- May still require two DOM query operations if the first element is not found.

**Library and Special JS feature**

* **closest**: The `closest` method is a part of the W3C specification (ECMAScript 2020) and is supported by modern web browsers. However, it may not be available in older browsers or environments.
* **CSS selectors**: The `.wrapper` class used in the benchmark is a CSS selector that allows for more efficient DOM querying.

**Other considerations**

When choosing between these two approaches, consider the following factors:

* Browser support: If you need to support older browsers, the `2x getById` approach may be more suitable.
* Performance-critical code: If your code requires optimal performance, using `getById + closest` might be a better option.
* Code readability and maintainability: The `getById + closest` approach can make the code more readable by reducing the number of redundant queries.

**Other alternatives**

If you need to support even older browsers or require additional features, you may want to consider alternative approaches:

* Using `querySelector` or `querySelectorAll` methods instead of `document.getElementById`.
* Utilizing CSS Grid or Flexbox layouts to avoid DOM query altogether.
* Implementing a custom solution using Web APIs like `XMLHttpRequest` or `fetch`.

Keep in mind that these alternatives might require additional resources, expertise, and optimizations to ensure optimal performance.

Related benchmarks:

2x getById vs getById + closest, nested (version: 0)

Comparing performance of: 2x getById vs getById + closest

Created: 3 years ago by: Guest

Jump to the latest result

2x getById

getById + closest

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):