Benchmark: Dataview vs Uint8Array - read short

Script Preparation code:

var size = 1024;
var buffer = new ArrayBuffer(size);
var bytes = new Uint8Array(buffer);
var dv = new DataView(buffer);

for (var i = 0; i < size; i++)
  dv.setUint8(i, Math.ceil(Math.random() * 255));

Tests:

DataView
for (var i = 0; i < size; i+=2) dv.getUint16(i);
Uint8Array
for (var i = 0; i < size; i+=2) bytes.subarray(i, i + 2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
DataView
Uint8Array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/119.0.6045.169 Mobile/15E148 Safari/604.1

Browser/OS: Chrome Mobile iOS 119 on iOS 16.6

View result in a separate tab

Test name	Executions per second
DataView	14858.5 Ops/sec
Uint8Array	9610.3 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is testing two approaches to read data from a buffer: `DataView` and `Uint8Array`.

**Options Compared**

There are two options being compared:

1. **DataView**: A binary view of an ArrayBuffer, which allows direct access to the underlying byte array.
2. **Uint8Array**: An array of unsigned 8-bit integers, where each element represents a single byte.

**Pros and Cons**

* **DataView**:
	+ Pros: Direct access to the underlying buffer, potentially more efficient for large datasets or complex data structures.
	+ Cons: Requires manual management of the buffer's length and offset, can be less intuitive for beginners.
* **Uint8Array**:
	+ Pros: More familiar and easier to use for developers, with a simpler and more linear memory model.
	+ Cons: May incur additional overhead due to array manipulation and indexing.

**Library**

In this benchmark, `DataView` is being used as a library function to access the underlying buffer. `DataView` provides a way to view an ArrayBuffer as if it were a typed array (in this case, a 16-bit integer array), allowing for direct access to the individual bytes.

**Special JavaScript Feature or Syntax**

There are no special features or syntax being tested in this benchmark. The code is written in standard JavaScript syntax.

**Other Considerations**

When choosing between `DataView` and `Uint8Array`, consider the following:

* If you need direct, fine-grained control over the buffer's data, `DataView` might be a better choice.
* If you're working with smaller datasets or need more high-level abstractions, `Uint8Array` might be sufficient.

**Alternatives**

Other alternatives for reading data from buffers include:

* **Typed Arrays**: Such as Int32Array, Uint16Array, etc. These provide a higher-level interface for accessing and manipulating arrays of integers.
* **Buffer APIs**: Such as Buffer.from() or Buffer.alloc(), which allow direct manipulation of the buffer's contents.

However, in this specific benchmark, `DataView` is being compared directly to `Uint8Array`, so these alternatives are not relevant.

Related benchmarks:

Dataview vs Uint8Array - read short (version: 0)

Comparing performance of: DataView vs Uint8Array

Created: 3 years ago by: Guest

Jump to the latest result

DataView

Uint8Array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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