Benchmark: Compare splicing methods

Script Preparation code:

const alphabet = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
    const numBatches = 10000;
    let exp = 1;
    let maxBatches = alphabet.length;
    while (numBatches > maxBatches) {
        maxBatches *= alphabet.length;
        exp++;
    }
    console.log(maxBatches, exp);

const potentialStops = _generatePotentialStops(alphabet, exp);
var arr = potentialStops;
var n = Math.round(potentialStops.length / numBatches);


function _generatePotentialStops(chars, exp) {
    if (exp === 1) return chars;
    const stops = [];
    for (const char of chars) {
        const addChars = _generatePotentialStops(chars, exp - 1);
        for (const addChar of addChars) {
            stops.push(char + addChar);
        }
    }
    return stops;
}

Tests:

splice
const res = []; while (arr.length) { const chunk = arr.splice(0, n); res.push([...chunk, arr[0]]); } return res;
loop-shift
const res = []; while (arr.length) { const chunk = []; for (let i = 0; i < n; i++) chunk.push(arr.shift()); res.push([...chunk, arr[0]]); } return res;
filter
const res = []; let start = 0; while (arr.length) { res.push(arr.filter((elem, idx) => idx >= start && idx < start + n + 1)); start += n; } return res;
slice
const res = []; let start = 0; while (arr.length) { res.push(arr.slice(start, start + n + 1)); start += n; } return res;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
loop-shift
filter
slice

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):

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial in ensuring that our code runs efficiently and effectively.

**Benchmark Overview**

The provided benchmark aims to compare the performance of different methods for splicing or removing elements from an array in JavaScript.

**Options Compared:**

1. `splice()`
2. `loop-shift`
3. `filter()`
4. `slice()`

**Pros and Cons:**

*   **`splice()`**: This method modifies the original array by removing the specified number of elements starting from a specified index.
    *   Pros: efficient for large arrays, simple syntax.
    *   Cons: modifies the original array, can be slow if used incorrectly (e.g., `splice(0, array.length)`).
*   **`loop-shift`**: This method creates a new array by shifting the elements to the left and then pushing the first element of the original array at the end.
    *   Pros: preserves the original array, simple syntax.
    *   Cons: can be slow for large arrays due to the overhead of creating new arrays and iterating over the original array.
*   **`filter()`**: This method creates a new array with elements that pass the test implemented by the provided function.
    *   Pros: efficient for large arrays, preserves the original array.
    *   Cons: can be slower than `splice()` due to the overhead of creating a new array and iterating over the original array. However, it's a good choice when preserving the original array is necessary.
*   **`slice()`**: This method creates a shallow copy of a portion of an array.
    *   Pros: preserves the original array, efficient for large arrays.
    *   Cons: can be slower than `splice()` due to the overhead of creating a new array and copying elements.

**Other Considerations**

*   **Array length**: The benchmark considers the impact of array length on performance. Larger arrays can lead to slower performance due to the overhead of memory management and indexing.
*   **Indexing**: The benchmark uses `Math.round(potentialStops.length / numBatches)` to generate a chunk size, which ensures that the array is divided into roughly equal-sized chunks.

**Library Used:**

None

**Special JavaScript Features/Syntax:**

No specific features or syntax are used in this benchmark. It focuses on comparing different array manipulation methods.

**Alternatives:**

*   For larger arrays, `filter()` and `slice()` might be more efficient than `splice()`.
*   If preserving the original array is necessary, `filter()` can be a better choice.
*   If simplicity is the primary concern, `loop-shift` or `splice()` might be suitable.

The provided benchmark helps developers understand the performance implications of different array manipulation methods in JavaScript. By considering factors like array length and indexing, it provides insights into optimizing code for efficient execution.

Related benchmarks:

Compare splicing methods (version: 0)

Comparing performance of: splice vs loop-shift vs filter vs slice

Created: 6 years ago by: Guest

Jump to the latest result

splice

loop-shift

filter

slice

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):