Benchmark: array insertAt with slice+concat VS splice

Tests:

slice and concat
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = "kitty"; var other = a.slice(0,10).concat(b).concat(a.slice(11));
splice
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = "kitty"; a.splice(10, 0, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice and concat
splice

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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Let's break down the provided JSON for the MeasureThat.net benchmark.

**What is being tested?**

The benchmark tests two different approaches to insert an element into an array: using `splice` and using `slice` with concatenation (`concat`). The goal is to determine which approach is faster.

**Options compared**

There are two options being compared:

1. **Splice**: This method modifies the original array by inserting a new element at a specified position.
2. **Slice + Concat**: This method creates a new array by:
	* Slicing the original array from the beginning to the 10th element using `slice(0,10)`.
	* Concatenating the sliced array with the new element (`b`) and then concatenating it with the remaining part of the original array (`a.slice(11)`).

**Pros and Cons**

**Splice:**

Pros:

* Modifies the original array in-place.
* Can be faster for large arrays since it avoids creating a new array.

Cons:

* Can be slower for small arrays or when using modern JavaScript engines with optimizations that prevent splicing from being efficient.
* Can throw errors if the index is out of bounds or if the element to be inserted cannot be pushed onto the stack.

**Slice + Concat:**

Pros:

* Creates a new array, which can be faster for small arrays since it avoids modifying the original array.
* Less prone to errors compared to `splice`.

Cons:

* Modifies the original array in-place (but only temporarily).
* Can create a new array with more memory usage.

**Library used**

None of the code uses any external libraries. The `concat` method is a built-in JavaScript method.

**Special JS features or syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. However, it's worth noting that some modern browsers may optimize `splice` to be faster due to its native implementation. Additionally, the use of `slice` and `concat` methods can create new arrays, which may not be desirable for large datasets.

**Alternatives**

If you wanted to run a similar benchmark but with different approaches, here are some alternatives:

1. **Array.prototype.push**: Instead of using `splice`, you could use `push` to add elements to the end of an array.
2. **Array.prototype.unshift**: You could use `unshift` instead of `slice` to add elements to the beginning of an array.
3. **Set**: If you're working with a small dataset, you could use a `Set` data structure instead of an array for faster lookups and insertions.

These alternatives would require modifications to the benchmark code to accommodate the new approaches.

Related benchmarks:

array insertAt with slice+concat VS splice (version: 0)

Comparing performance of: slice and concat vs splice

Created: 5 years ago by: Guest

Jump to the latest result

slice and concat

splice

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):