Benchmark: setAttribute vs data property

Script Preparation code:

var textNode = document.createTextNode('');
var div = document.createElement('div');

Tests:

TextNode data
for (var c=0;c<1000;c++) { textNode.data = c%2; }
Div setAttribute
for (var c=0;c<1000;c++) { div.setAttribute('tick', c%2); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
TextNode data
Div setAttribute

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 provided benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches:

1. Setting a data property on a `Text` node (`TextNode data`)
2. Setting an attribute on an HTML element (`Div setAttribute`)

**Comparison Options**

The benchmark tests two options for setting properties and attributes:

* **TextNode data**: This approach uses the `data` property to store a value, which is then updated in each iteration of the loop. The `data` property is a special property that can be used to store arbitrary data on a `Text` node.
* **Div setAttribute**: This approach uses the `setAttribute()` method to set an attribute named "tick" on an HTML element (`div`). The value of this attribute is updated in each iteration of the loop.

**Pros and Cons**

**TextNode data:**

Pros:

* More concise code, as no additional attributes need to be declared.
* Can potentially lead to better cache locality, as the `data` property is stored directly on the node.

Cons:

* May not be supported by all browsers or older versions of JavaScript.
* Can be slower for very large arrays or objects, as it may require more memory allocations.

**Div setAttribute:**

Pros:

* Widely supported across different browsers and versions of JavaScript.
* Can be faster for very large arrays or objects, as it avoids the need for additional memory allocations.

Cons:

* Requires an extra step to declare the attribute name, which can add overhead to the code.
* May lead to worse cache locality due to the additional indirection through the `setAttribute()` method.

**Library and Special JS Features**

In this benchmark, no libraries are used beyond the standard JavaScript API. No special JavaScript features or syntax are applied.

**Alternatives**

Other alternatives for setting properties and attributes include:

* **Object.assign()**: This method can be used to assign values to properties on an object, including `Text` nodes.
* **Element.setAttribute()` with a string value: In this approach, the attribute name would be a string literal, rather than a variable. This may lead to better cache locality due to the fixed length of the attribute names.

**Benchmark Preparation Code**

The provided preparation code is:

```javascript
var textNode = document.createTextNode('');
var div = document.createElement('div');
```

This creates an empty `Text` node and an empty HTML element (`div`). The `TextNode data` test case uses these elements to store and update values, while the `Div setAttribute` test case uses the same elements but sets attributes instead.

Related benchmarks:

setAttribute vs data property (version: 0)

Comparing performance of: TextNode data vs Div setAttribute

Created: 6 years ago by: Guest

Jump to the latest result

TextNode data

Div setAttribute

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):