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));
}

​x
 
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);

 
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);

 
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

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

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: 3 months 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 4 months ago):

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

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.
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.
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

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.
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.
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:

Using bitwise operations (e.g., byte & 0x80 === 0).
Implementing a custom conversion function using SIMD instructions.
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.

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: 7 months ago by: Guest

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