Benchmark: Splice vs new Array Fix

Script Preparation code:

var randomArray=Array.from({length: 1000}, () => Math.floor(Math.random() * 100));

Tests:

Splice
for (let i = randomArray.length - 1; i >= 0; --i) { if (randomArray[i] != 1) { continue; } randomArray.splice(i, 1); } return randomArray;
Copy to new
var newArray = []; for (let i = randomArray.length - 1; i >= 0; --i) { if (randomArray[i] == 1) { continue; } newArray.push(randomArray[i]); } return newArray;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
Copy to new

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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I'll break down the provided benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Overview**

The test compares two approaches for removing elements from an array: `splice` (Splice) and creating a new array using `Array.from` (Copy to new).

**Script Preparation Code**

The script preparation code creates a random array of 1000 integers between 0 and 100:
```javascript
var randomArray = Array.from({length: 1000}, () => Math.floor(Math.random() * 100));
```
This array is used as input for both test cases.

**Test Cases**

There are two individual test cases:

1. **Splice**
The test case uses `splice` to remove elements from the original array:
```javascript
for (let i = randomArray.length - 1; i >= 0; --i) {
  if (randomArray[i] != 1) {
    continue;
  }
  randomArray.splice(i, 1);
}
return randomArray;
```
2. **Copy to new**
The test case creates a new array using `Array.from` and copies the desired elements:
```javascript
var newArray = [];
for (let i = randomArray.length - 1; i >= 0; --i) {
  if (randomArray[i] == 1) {
    continue;
  }
  newArray.push(randomArray[i]);
}
return newArray;
```
**Library and Syntax**

In this benchmark, `Array.from` is used to create a new array. This is a modern JavaScript feature introduced in ECMAScript 2015.

**Options Compared**

The two test cases compare the performance of:

* **Splice**: uses the `splice` method to remove elements from the original array.
* **Copy to new**: creates a new array using `Array.from` and copies the desired elements.

**Pros and Cons**

Here are some pros and cons of each approach:

**Splice**

Pros:

* Easy to implement
* No extra memory allocation is required

Cons:

* Can be slow, especially for large arrays
* Modifies the original array

**Copy to new**

Pros:

* Faster than `splice` for large arrays
* Does not modify the original array

Cons:

* Requires extra memory allocation
* More complex implementation

**Other Considerations**

When choosing between `splice` and `Array.from`, consider the following:

* If you need to remove elements from an array while iterating over it, `splice` can be a convenient option. However, if you're working with large arrays or performance is critical, `Array.from` might be a better choice.
* If you need to create a new array without modifying the original one, `Array.from` is the way to go.

**Alternatives**

Other alternatives for removing elements from an array include:

* Using `filter()` method
* Using a for loop with array indices
* Using `some()` and `findIndex()` methods

However, these approaches may have different performance characteristics or require additional memory allocation compared to `splice` and `Array.from`.

Related benchmarks:

Splice vs new Array Fix (version: 0)

Comparing performance of: Splice vs Copy to new

Created: 3 years ago by: Guest

Jump to the latest result

Splice

Copy to new

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):