Benchmark: Insert new Item on specific Index

Tests:

Native Methods
// Params: var arr = [1, 2, 3, 4]; const index = 3; const newItem = 5; // Steps: // 1. Create new array from the original one at given index let start = arr.slice(0, index); // 2. Add new item to the copy start.push(newItem); // 3. Get the rest of the original array let end = arr.slice(index); // 4. Save result arr = start.concat(end) // 5. Print the merged array console.log(arr);
Custom Loop
// Params: var arr = [1, 2, 3, 4]; const index = 3; const newItem = 5; var temp; var newArr = [...arr]; for(var i = index; i < arr.length; i++){ if(temp === undefined){ temp = newArr[i]; }else{ var t = newArr[i]; newArr[i] = temp; temp = t; } } newArr[arr.length] = temp; newArr[index] = newItem; arr = [...newArr]; console.log(arr);
Other Custom Loop
// Params: var arr = [1, 2, 3, 4]; const index = 3; const newItem = 5; // Steps: // 1. Create new array from the original one at given index let copy = []; for (let i = 0; i < index; i++) { copy[copy.length] = arr[i]; } // 2. Add new item to the copy copy[index] = newItem; // 3. Get the rest of the original array let rest = []; for (let i = index; i < arr.length; i++) { rest[rest.length] = arr[i]; } // 4. Merge the two arrays for (let i = 0; i < rest.length; i++) { copy[copy.length] = rest[i]; } // 5. Save new arr arr = [...copy]; // 6. Print the merged array console.log(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native Methods
Custom Loop
Other Custom Loop

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll dive into the explanation.

The provided benchmark measures the performance of three different approaches to insert a new item at a specific index in an array:

1. **Native Methods**: This approach uses built-in JavaScript methods, such as `slice()` and `concat()`, to achieve the desired result.
2. **Custom Loop (Approach 1)**: This approach uses a traditional loop to manually copy elements from the original array and then insert the new item at the specified index.
3. **Other Custom Loop**: This approach is identical to the second custom loop, with minor formatting differences.

Now, let's discuss the pros and cons of each approach:

**Native Methods**

Pros:

* Fast execution time: Built-in methods are optimized for performance.
* Concise code: Easy to read and write.
* Low memory usage: Only creates a temporary copy of the array.

Cons:

* Limited control over the copying process: The `slice()` method returns a shallow copy, which might not be suitable for complex data structures.
* Potential performance issues with very large arrays: Some browsers may optimize away the unnecessary copies.

**Custom Loop (Approach 1)**

Pros:

* Fine-grained control: Allows for manual optimization and customization of the copying process.
* Suitable for complex data structures: Can handle nested or object-based arrays.

Cons:

* Slower execution time: Manual looping can be slower than built-in methods.
* Higher memory usage: Creates an extra array to store the copied elements.
* More code complexity: Requires more lines of code and potential errors.

**Other Custom Loop**

This approach is identical to the second custom loop, so it shares the same pros and cons as Approach 1.

The test cases use no special JavaScript features or syntax beyond basic JavaScript fundamentals. No advanced concepts like async/await, promises, or modern language features are utilized.

For those familiar with performance optimization, here's a rough estimate of the complexity:

* Native Methods: O(n) copying time (where n is the array length).
* Custom Loop (Approach 1): O(n^2) copying time due to manual looping.
* Other Custom Loop: Same as Approach 1.

To achieve optimal performance, it's essential to consider factors like:

* Array size and complexity
* Browser support and optimization
* Memory constraints
* Code readability and maintainability

Alternatives to these approaches include:

* Using `splice()` instead of `concat()`: Can be faster but may cause unnecessary array reallocation.
* Leveraging modern JavaScript features like `Array.prototype.map()` or `Array.prototype.reduce()`: May offer performance benefits, but their usage depends on the specific use case.
* Exploring third-party libraries or custom implementations for more advanced array manipulation techniques.

Keep in mind that benchmark results can vary across different browsers and environments. It's essential to consider these factors when choosing an approach for a specific project.

Related benchmarks:

Insert new Item on specific Index (version: 0)

Comparing performance of: Native Methods vs Custom Loop vs Other Custom Loop

Created: 3 years ago by: Guest

Jump to the latest result

Native Methods

Custom Loop

Other Custom Loop

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):