Benchmark: del from array by value

Script Preparation code:

var arr = [1,2,3,4,5,6,7,8,9,8,7,0,6,5,4,3,2,1];

function arrMove(arr, val) {
  var j = 0;
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] !== val) {
      arr[j++] = arr[i];
    }
  }
  arr.length = j;
  return arr;
}

function arrFilter(arr, val) {
  return arr.filter(v => v!== val);
}


function arrIndexOf(arr, val) {
  var ind = arr.indexOf(val);
  arr.splice(ind, 1);
}

Tests:

move
var resultArray = arrMove([...arr], 0);
filter
var resultArray = arrFilter([...arr], 0);
index of
var resultArray = arrIndexOf([...arr], 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
move
filter
index of

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition JSON**

The provided JSON represents a JavaScript microbenchmark that measures the performance of three different functions: `arrMove`, `arrFilter`, and `arrIndexOf`. The `arrMove` function removes all occurrences of a specified value from an array, while `arrFilter` returns a new array with all elements equal to the specified value removed. The `arrIndexOf` function finds the index of the first occurrence of a specified value in the array and then removes it.

**Options Compared**

The benchmark compares three different approaches:

1.  **Array Splice**: This approach uses the `splice()` method to remove elements from the array. It's a simple and efficient way to modify an array, but it can be slow for large arrays.
2.  **Array Filter**: This approach uses the `filter()` method to create a new array with only the elements that don't match the specified value. It's generally faster than using `splice()`, as it doesn't modify the original array.
3.  **IndexOf and Splice**: This approach finds the index of the first occurrence of the specified value using `indexOf()`, then uses `splice()` to remove the element at that index.

**Pros and Cons**

*   **Array Splice**:
    *   Pros: Simple, efficient for small arrays.
    *   Cons: Can be slow for large arrays due to the overhead of modifying the array.
*   **Array Filter**:
    *   Pros: Generally faster than `splice()` for large arrays. Creates a new array, so doesn't modify the original.
    *   Cons: Can use more memory since it creates a new array.
*   **IndexOf and Splice**:
    *   Pros: Efficient for finding the index of an element.
    *   Cons: Requires two operations (finding the index and then removing), which can be slower than using `filter()` or `splice()`.

**Library Usage**

There is no explicit library usage mentioned in the provided benchmark definition. However, some JavaScript methods like `filter()`, `indexOf()`, and `splice()` are built-in methods that come with JavaScript, so they don't require any additional libraries.

**Special JS Features or Syntax**

The provided benchmark definition uses the following special features:

*   **Destructuring**: The `[...arr]` syntax is used to create a new array with all elements from the original array. This feature is only available in ECMAScript 2015 and later versions.
*   **Arrow Functions**: The `v => v !== val` syntax uses an arrow function, which was introduced in ECMAScript 2012.

**Other Alternatives**

If you're interested in exploring other alternatives or optimizations for array manipulation, here are a few options:

*   **Array.prototype.map() and Array.prototype.filter()**: These methods can be used instead of `filter()` to create a new array with filtered elements.
*   **For...of loop**: This loop can be used instead of `for` loops for iterating over arrays or objects.

In terms of optimizing the performance of array operations, you may also want to consider:

*   **Using `TypedArray` types**: If you know that your data will only contain specific numeric values, using `TypedArray` types (like `Int32Array`) can provide better performance.
*   **Avoiding unnecessary operations**: Minimize the number of times you access or modify elements in an array to reduce overhead.

Feel free to ask if there's anything else I can help with!

Related benchmarks:

del from array by value (version: 0)

lets see

Comparing performance of: move vs filter vs index of

Created: 6 years ago by: Registered User

Jump to the latest result

move

filter

index of

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):