Benchmark: test array metod

Script Preparation code:

var someList = {
    value: 1,
    next: {
        value: 2,
        next: {
            value: 3,
            next: {
                value: 4,
                next: null
            }
        }
    }
};

Tests:

unshift
function reversePrint(linkedList) { const result = []; while(linkedList.next != null){ result.unshift(linkedList.value); linkedList = linkedList.next; } result.unshift(linkedList.value); console.log(...result); } reversePrint(someList);
push and reverse
function reversePrint1(linkedList) { const result = []; while(linkedList.next != null){ result.push(linkedList.value); linkedList = linkedList.next; } result.push(linkedList.value); console.log(...result.reverse()); } reversePrint1(someList);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
unshift
push and reverse

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 world of JavaScript microbenchmarks.

The provided JSON represents a benchmark test for comparing the performance of two methods: `unshift` and `push` with `reverse()` in JavaScript. The test is designed to measure which approach is faster.

**Test Case 1: unshift**

In this test case, the code uses an array-like object (`someList`) as a linked list. The `unshift` method is used to add elements to the beginning of the list. The benchmark definition contains a custom function named `reversePrint`, which takes a linked list as input and prints its values in reverse order.

**Pros of using unshift:**

1. **Efficient insertion**: `unshift` has an average time complexity of O(1), making it suitable for inserting elements at the beginning of the array-like object.
2. **Less overhead**: Since `unshift` only needs to update the head pointer, it requires less memory allocation and deallocation compared to `push`.

**Cons of using unshift:**

1. **Slower performance**: When the linked list is very large, `unshift` can be slower than `push` due to its O(1) time complexity.
2. **More memory allocation**: Although `unshift` has less overhead in terms of memory allocation, it still requires more memory allocations when dealing with a large number of elements.

**Test Case 2: push and reverse**

In this test case, the code uses the same array-like object (`someList`) as a linked list. However, instead of using `unshift`, it uses `push` to add elements to the end of the list. The benchmark definition contains another custom function named `reversePrint1`, which takes a linked list as input and prints its values in reverse order using the `reverse()` method.

**Pros of using push and reverse:**

1. **Faster performance**: When dealing with large linked lists, `push` followed by `reverse()` can be faster than `unshift`.
2. **Simplified implementation**: The `reverse()` method is a built-in JavaScript function that reverses an array-like object, making it easier to implement.

**Cons of using push and reverse:**

1. **More memory allocation**: `push` requires more memory allocations compared to `unshift`, especially when dealing with large numbers of elements.
2. **Higher overhead**: The `reverse()` method has a higher time complexity (O(n)) compared to `unshift` (O(1)), which can lead to slower performance for very large linked lists.

**Library and Special JS Feature**

There are no libraries or special JavaScript features mentioned in the benchmark definition. However, it's worth noting that the custom functions `reversePrint` and `reversePrint1` rely on the fact that JavaScript objects have a built-in way of traversing their properties using dot notation (`someList.value`, `someList.next`, etc.).

**Alternatives**

If you want to compare the performance of other methods, here are some alternatives:

* Using an actual array instead of an array-like object
* Comparing the performance of different data structures, such as a linked list with nodes having only `next` and `value` properties (instead of `next` and `value: X`)
* Measuring the performance of different sorting algorithms, such as bubble sort or merge sort, on large datasets

Keep in mind that the choice of alternatives depends on the specific use case and requirements.

Related benchmarks:

test array metod (version: 0)

unshift vs push and reverse()

Comparing performance of: unshift vs push and reverse

Created: 6 years ago by: Guest

Jump to the latest result

unshift

push and reverse

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):