Benchmark: spreadArray - MeasureThat.net

Script Preparation code:

var testArray = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
var delim = {'a': 1};

function spreadArrayErtema(array, delim) {
    return array.reduce(function (result, item) {
        result.push(delim, item);
        
        return result;
    }, []).slice(0, -1);
}

function spreadArrayKbakba(arr, delim) {
    var result = []
    for (var i = arr.length - 1; i >= 0; i--) {
        result.unshift(arr[i], delim);
    };
    result.pop();
    return result;
}


function spreadArrayComparsionAndConcat(array, delim) {
    return array.reduce(function (result, item, i) {
        return i === 0 ? result.concat(item) : result.concat(delim, item);
    }, []);
}

function spreadArrayConcat(array, delim) {
    return array.reduce(function (result, item, i) {
        return result.concat(delim, item);
    }, []).slice(0, -1);
}

function spreadArrayComparsion(array, delim) {
    return array.reduce(function (result, item, i) {
         if (i === 0) {
           result.push(item);
         } else {
           result.push(delim, item);
         }
      
        return result;
    }, []);
}

Tests:

spreadArray by ertema
spreadArrayErtema(testArray, delim);
spreadArray by kbakba
spreadArrayKbakba(testArray, delim);
spreadArray with comparsion and concat
spreadArrayComparsionAndConcat(testArray, delim);
spreadArray with concat only
spreadArrayConcat(testArray, delim);
spreadArray with comparsion only
spreadArrayComparsion(testArray, delim);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spreadArray by ertema
spreadArray by kbakba
spreadArray with comparsion and concat
spreadArray with concat only
spreadArray with comparsion only

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance of four different implementations of the `spreadArray` function, which is supposed to work like a join but returns an array instead. The function takes two parameters: an array and an object (in this case, a delimiter).

**Implementations Compared**

There are four implementations compared:

1. `spreadArrayErtema`
2. `spreadArrayKbakba`
3. `spreadArrayComparsionAndConcat`
4. `spreadArrayConcat`

Each implementation has its own approach to processing the array and applying the delimiter.

**Options Compared**

Here's a brief description of each option and their pros and cons:

1. **`spreadArrayErtema`**: This implementation uses the `reduce` method to process the array. It iterates over the array, pushes the delimiter and each item onto the result array, and finally returns the result after removing the last element (the delimiter). Pros: simple and straightforward. Cons: may have unnecessary iterations or operations.
2. **`spreadArrayKbakba`**: This implementation uses a loop to process the array in reverse order. It iterates over the array from the end to the beginning, adding the delimiter and each item onto the result array. Finally, it removes the last element (the delimiter) before returning the result. Pros: potentially more efficient due to iterating in reverse order. Cons: may have unnecessary iterations or operations.
3. **`spreadArrayComparsionAndConcat`**: This implementation uses the `reduce` method with a conditional statement to process the array. It iterates over the array, adding the delimiter and each item onto the result array only when it's not the first item (i.e., the initial result is empty). Pros: potentially more efficient due to reducing unnecessary iterations or operations. Cons: may be less readable due to the conditional statement.
4. **`spreadArrayConcat`**: This implementation uses the `reduce` method with no conditional statements, simply concatenating each item onto the result array without any delimiter. Pros: simple and straightforward. Cons: may have unnecessary iterations or operations.

**Library**

The benchmark does not use a specific library, but it relies on the built-in JavaScript `Array.prototype.reduce` method.

**Special JS Feature/ Syntax**

There are no special features or syntax used in this benchmark that would require advanced knowledge of JavaScript.

**Other Considerations**

When interpreting benchmark results, consider factors such as:

* Execution rate: Higher execution rates indicate better performance.
* Execution consistency: Consistent execution rates across different devices and browsers suggest more efficient implementations.
* Context switching: Frequent context switches can impact performance, so it's essential to choose an implementation with minimal overhead.

**Alternatives**

For those interested in exploring alternative approaches or implementing the `spreadArray` function from scratch, consider:

* Using a different algorithm or data structure, such as a stack or queue, to process the array.
* Utilizing JavaScript functions like `forEach`, `map`, or `filter` instead of `reduce`.
* Implementing the delimiter object using a different data structure, such as an object literal or a JSON object.

Keep in mind that these alternatives might not be representative of real-world scenarios and may impact performance.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.113 Safari/537.36

Browser/OS: Chrome 53 on Windows

View result in a separate tab

Test name	Executions per second
spreadArray by ertema	406580.0 Ops/sec
spreadArray by kbakba	270247.7 Ops/sec
spreadArray with comparsion and concat	45962.0 Ops/sec
spreadArray with concat only	40481.9 Ops/sec
spreadArray with comparsion only	472395.6 Ops/sec

Related benchmarks:

spreadArray (version: 2)

Function that works like a join, but returns array

Comparing performance of: spreadArray by ertema vs spreadArray by kbakba vs spreadArray with comparsion and concat vs spreadArray with concat only vs spreadArray with comparsion only

Created: 8 years ago by: Registered User

Jump to the latest result

spreadArray by ertema

spreadArray by kbakba

spreadArray with comparsion and concat

spreadArray with concat only

spreadArray with comparsion only

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):