Benchmark: Shifting array elements

Script Preparation code:

var arr = [];
var intArr = new Uint8Array(1000000)

for(let i=0; i<1000000; i++){
  arr.push(i)
  intArr[i] = i
}

Tests:

Array
arr.splice(0, 50)
TypedArray
intArr.set(intArr.subarray(100))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array
TypedArray

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON data and explain what is being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark definition is represented by the `Script Preparation Code` in the provided JSON data:
```javascript
var arr = [];
var intArr = new Uint8Array(1000000);

for(let i=0; i<1000000; i++){
  arr.push(i);
  intArr[i] = i;
}
```
This script preparation code creates two arrays: `arr` (a JavaScript array) and `intArr` (a Typed Array). The script then populates both arrays with one million elements using a simple loop.

**Comparison Options**

The benchmark is comparing two different approaches:

1. **Array Splice**: `arr.splice(0, 50)`
This option tests the performance of removing 50 elements from the beginning of the `arr` array.
2. **Typed Array Set**: `intArr.set(intArr.subarray(100))`
This option tests the performance of setting a value at a specific index in the `intArr` Typed Array.

**Pros and Cons**

**Array Splice:**

Pros:

* Wide support across modern browsers
* Easy to understand and implement

Cons:

* Can be slow due to the creation of a new array
* May involve additional memory allocation

**Typed Array Set:**

Pros:

* Optimized for performance in typed arrays
* May be faster than Array Splice for large arrays

Cons:

* Requires support for Typed Arrays, which may not be available in older browsers
* Can be less intuitive to understand and implement

**Other Considerations**

The use of a `Uint8Array` instead of a `NumberArray` or other data types is likely due to the need for efficient memory allocation and access patterns. The choice of using `subarray(100)` to set a value at a specific index in the Typed Array suggests that the benchmark is testing performance for large arrays.

**Library Usage**

None of the provided benchmarks use any external libraries.

**Special JavaScript Features or Syntax**

The benchmark does not explicitly mention any special JavaScript features or syntax, but it relies on modern features such as:

* `Uint8Array` and `TypedArray`
* ES6+ syntax (e.g., arrow functions, template literals)

**Alternatives**

Other alternatives for similar benchmarks could include:

* Comparing the performance of other array manipulation methods, such as `slice()`, `concat()`, or `fill()`.
* Using different data types, such as `Float64Array` or `BigInt64Array`, to test performance characteristics.
* Adding additional complexity to the benchmark, such as shuffling or sorting the arrays before performing operations.

Keep in mind that the choice of alternatives depends on the specific goals and requirements of the benchmark.

Related benchmarks:

Shifting array elements (version: 0)

Comparing performance of: Array vs TypedArray

Created: 5 years ago by: Guest

Jump to the latest result

Array

TypedArray

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):