Benchmark: change Float64Array vs array.push (change)

Script Preparation code:

var size = 1024;

var initialArray = [];
for(let i = 0; i < size; i++) {
  initialArray.push(Math.random());
}

​x
 
var size = 1024;​var initialArray = [];for(let i = 0; i < size; i++) {  initialArray.push(Math.random());}

Tests:

typed array

const arr = new Float64Array(size);
for(let i = 0; i < size; i++) {
  arr[i] = initialArray[i]/2;
}

 
const arr = new Float64Array(size);for(let i = 0; i < size; i++) {  arr[i] = initialArray[i]/2;}

not typed array
const arr = []; for(let i = 0; i < size; i++) { arr.push(initialArray[i]/2); }
const arr = [];
for(let i = 0; i < size; i++) {
arr.push(initialArray[i]/2);
}

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
typed array
not typed array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
typed array	743068.9 Ops/sec
not typed array	252112.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

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

Benchmark Purpose: The goal of this benchmark is to compare the performance of two approaches when modifying an array in JavaScript:

Using a Float64Array (a typed array) instead of a regular array.
Modifying a regular array using the push() method.

Options Compared:

Typed Array (Float64Array): This option uses the Float64Array constructor to create an array with a specific data type (64-bit floating-point numbers). This can provide better performance and more precise calculations compared to using a regular array.
Regular array with push() method: This option uses the push() method to add elements to a regular array. While this is a common way to append elements, it may be slower than using a typed array or other optimized data structures.

Pros and Cons:

Typed Array (Float64Array):
- Pros:
  - Can provide better performance due to more efficient memory management.
  - May offer more precise calculations for numerical computations.
- Cons:
  - Limited support on older browsers or environments that don't understand typed arrays.
  - Requires additional setup and initialization before use.
Regular array with push() method:
- Pros:
  - Wide compatibility across modern browsers and environments.
  - Easy to implement and set up.
- Cons:
  - May be slower due to the overhead of the push() method.
  - Can lead to less precise calculations for numerical computations.

Library Used: None, as this benchmark only uses built-in JavaScript features and data structures (arrays).

Special JS Feature/Syntax: The benchmark does not utilize any special JavaScript features or syntax beyond what is commonly used in modern web development. No ES6+ features, no WebAssembly, etc.

Other Alternatives:

Using other typed arrays like Int32Array, Uint8Array, or BigInt64Array might also be compared to see if they offer better performance.
Implementing a custom data structure or algorithm could be used as an alternative approach, but this would likely require significant changes to the benchmark.

The current benchmark focuses on comparing the performance of using a typed array (Float64Array) versus a regular array with the push() method. If you'd like to explore other approaches or optimizations, feel free to modify the benchmark script and see how it affects the results!

LLMs can make mistakes. Check important info.

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

**Benchmark Purpose:**
The goal of this benchmark is to compare the performance of two approaches when modifying an array in JavaScript:

1. Using a `Float64Array` (a typed array) instead of a regular `array`.
2. Modifying a regular `array` using the `push()` method.

**Options Compared:**

* **Typed Array (`Float64Array`)**: This option uses the `Float64Array` constructor to create an array with a specific data type (64-bit floating-point numbers). This can provide better performance and more precise calculations compared to using a regular `array`.
* **Regular `array` with `push()` method**: This option uses the `push()` method to add elements to a regular `array`. While this is a common way to append elements, it may be slower than using a typed array or other optimized data structures.

**Pros and Cons:**

* **Typed Array (`Float64Array`)**:
	+ Pros:
		- Can provide better performance due to more efficient memory management.
		- May offer more precise calculations for numerical computations.
	+ Cons:
		- Limited support on older browsers or environments that don't understand typed arrays.
		- Requires additional setup and initialization before use.
* **Regular `array` with `push()` method**:
	+ Pros:
		- Wide compatibility across modern browsers and environments.
		- Easy to implement and set up.
	+ Cons:
		- May be slower due to the overhead of the `push()` method.
		- Can lead to less precise calculations for numerical computations.

**Library Used:**
None, as this benchmark only uses built-in JavaScript features and data structures (arrays).

**Special JS Feature/Syntax:**
The benchmark does not utilize any special JavaScript features or syntax beyond what is commonly used in modern web development. No ES6+ features, no WebAssembly, etc.

**Other Alternatives:**

* Using other typed arrays like `Int32Array`, `Uint8Array`, or `BigInt64Array` might also be compared to see if they offer better performance.
* Implementing a custom data structure or algorithm could be used as an alternative approach, but this would likely require significant changes to the benchmark.

The current benchmark focuses on comparing the performance of using a typed array (`Float64Array`) versus a regular `array` with the `push()` method. If you'd like to explore other approaches or optimizations, feel free to modify the benchmark script and see how it affects the results!

Related benchmarks:

change Float64Array vs array.push (change) (version: 0)

Comparing performance of: typed array vs not typed array

Created: 4 years ago by: Guest

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