Benchmark: Binary to boolean with DataView: readUint8() with for loop vs. slice() with map() vs. slice() with Array.from()

Tests:

readUint8() with for loop
const length = 1000; const arrayBuffer = new ArrayBuffer(length); const array = new Uint8Array(arrayBuffer); for (let i = 0; i < length; i++) { array[i] = 22; } const dataView = new DataView(arrayBuffer); const resultArray = []; for (let i = 0; i < length; i++) { const value = dataView.getUint8(i); resultArray.push(Boolean(value)); }
slice() with map()
const length = 1000; const arrayBuffer = new ArrayBuffer(length); const array = new Uint8Array(arrayBuffer); for (let i = 0; i < length; i++) { array[i] = 22; } const dataView = new DataView(arrayBuffer); const transferArray = new Uint8Array(dataView); const resultArray = [...transferArray].map(Boolean);
slice() with Array.from()
const length = 1000; const arrayBuffer = new ArrayBuffer(length); const array = new Uint8Array(arrayBuffer); for (let i = 0; i < length; i++) { array[i] = 22; } const dataView = new DataView(arrayBuffer); const transferArray = new Uint8Array(dataView); const resultArray = Array.from(transferArray, Boolean);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
readUint8() with for loop
slice() with map()
slice() with Array.from()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 27 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser/OS: Firefox 132 on Windows

View result in a separate tab

Test name	Executions per second
readUint8() with for loop	22900.2 Ops/sec
slice() with map()	137948.8 Ops/sec
slice() with Array.from()	153412.9 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark that tests the performance of three different approaches to convert binary data ( Uint8Array ) to boolean values.

**Approaches Compared**

1. **`readUint8() with for loop`**: This approach uses the `DataView.getUint8()` method to read individual bytes from the Uint8Array and then converts each byte to a boolean value using a `for` loop.
2. **`slice() with map()`**: This approach uses the `Array.prototype.slice()` method to create a new Uint8Array view, followed by the `map()` function to convert each byte to a boolean value.
3. **`slice() with Array.from()`**: This approach uses the `Array.prototype.slice()` method to create a new Uint8Array view and then converts each byte to a boolean value using the `Array.from()` method.

**Pros and Cons of Each Approach**

1. **`readUint8() with for loop`**:
	* Pros: Simple, straightforward implementation.
	* Cons: May be slower due to the overhead of reading individual bytes and iterating over the array.
2. **`slice() with map()`**: This approach is often considered the most efficient way to convert binary data to boolean values in modern JavaScript engines.
	* Pros: Fast execution, as it uses the optimized `map()` function.
	* Cons: May require additional memory allocation for the intermediate slice array.
3. **`slice() with Array.from()`**:
	* Pros: Similar efficiency to the `map()` approach and avoids the need for an intermediate array.
	* Cons: Requires support for the `Array.from()` method, which may not be available in older browsers.

**Library Used**

None explicitly mentioned. However, the benchmark uses modern JavaScript features, such as `DataView`, `Array.prototype.slice()`, and `Array.from()`.

**Special JS Features/Syntax**

None mentioned.

**Other Considerations**

* The benchmark is designed to measure the performance of these approaches on a specific dataset (1000 bytes) and may not be representative of real-world use cases.
* The benchmark results are dependent on the browser, device platform, and operating system used for execution.
* Other factors that may impact performance, such as caching and optimization algorithms implemented by the JavaScript engine, are not accounted for in this benchmark.

**Alternatives**

Other approaches to converting binary data to boolean values might include:

1. Using bitwise operations (e.g., `byte & 0x80 === 0`).
2. Implementing a custom conversion function using SIMD instructions.
3. Leveraging hardware acceleration through WebAssembly or other low-level APIs.

However, these alternatives are likely to be less efficient and may not be supported by all browsers or devices.

Related benchmarks:

Binary to boolean with DataView: readUint8() with for loop vs. slice() with map() vs. slice() with Array.from() (version: 0)

Comparing performance of: readUint8() with for loop vs slice() with map() vs slice() with Array.from()

Created: 4 months ago by: Guest

Jump to the latest result

readUint8() with for loop

slice() with map()

slice() with Array.from()

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):