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(-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;
}

Tests:

ertema version
spreadArrayErtema(testArray, delim);
kbakba version
spreadArrayKbakba(testArray, delim);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ertema version
kbakba version

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 dive into the provided benchmark definition and test cases.

**Benchmark Definition:**
The benchmark measures the performance of two different JavaScript functions, `spreadArrayErtema` and `spreadArrayKbakba`, which appear to be variations of the spread operator (`...`) used in JavaScript. The purpose of these functions is to append an object (`delim`) to each element in a given array (`array`).

**Options Compared:**
The two options being compared are:

1. `spreadArrayErtema`: This function uses the `reduce()` method and pushes the `delim` object onto the result array, then returns the last element of the resulting array.
2. `spreadArrayKbakba`: This function uses a for loop to iterate over the input array in reverse order, unshifting each element (including the `delim` object) into the result array.

**Pros and Cons:**

* **`spreadArrayErtema`**
	+ Pros:
		- Cleaner code using `reduce()`
		- Efficient use of array methods
	+ Cons:
		- May be less readable for those unfamiliar with `reduce()` or functional programming concepts
		- Might incur higher overhead due to the function call and object creation
* **`spreadArrayKbakba`**
	+ Pros:
		- More straightforward, loop-based approach
		- Easy to understand for developers familiar with traditional loops
	+ Cons:
		- May be less efficient due to the need to unshift elements into an array
		- Uses more memory due to the creation of temporary arrays

**Library:**
None explicitly mentioned in the benchmark definition.

**Special JS Features/Syntax:**
The benchmark uses `reduce()` and object spread syntax (`delim = { ... }`), which are standard features of modern JavaScript. However, `reduce()` is a bit more advanced, so it might require some explanation to less experienced developers.

**Other Considerations:**

* The benchmark measures the execution speed of each function on the same input data, which provides a fair comparison.
* Using an array (`testArray`) and object (`delim`) as test data simplifies the implementation and makes the benchmark more concise.
* Skipping preamble or setup code is beneficial for measuring performance, as it reduces overhead and focuses solely on the functionality being tested.

**Alternatives:**
If you're interested in exploring alternative approaches, here are a few options:

1. Using `Array.prototype.push()` instead of `reduce()`.
2. Implementing the spread operator manually using bitwise operators (`Math.pow(2, 16)`).
3. Comparing performance with different array lengths or data distributions.
4. Adding additional test cases to cover edge cases, such as empty arrays or objects.

Keep in mind that these alternatives might alter the benchmark's focus and results, so it's essential to understand the implications before making changes.

Related benchmarks:

spreadArray (version: 0)

Comparing performance of: ertema version vs kbakba version

Created: 9 years ago by: Guest

Jump to the latest result

ertema version

kbakba version

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):