Benchmark: remove element using splice slice vs spread slice

Script Preparation code:

arr = [...Array(100000).keys()];
index = 999;

Tests:

splice slice
arr.splice(index,1); arr2 = arr.slice();
spread slice
arr2 = [...arr.slice(0,index),...arr.slice(index+1)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice slice
spread slice

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 benchmark and analyze what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches for removing an element from an array:

1. `arr.splice(index, 1);`
2. `arr2 = [...arr.slice(0, index), ...arr.slice(index + 1)];`

The goal is to determine which approach is faster and more efficient.

**Approach 1: Using `splice`**

* **Description**: The `splice` method modifies the original array by removing the element at the specified index (`index`) and returns an array of the removed elements. In this case, it's only removing one element.
* **Pros**:
	+ Simple to implement
	+ Works directly on the original array
* **Cons**:
	+ Can be slower due to the modification of the original array
	+ May not be suitable for large arrays or complex data structures

**Approach 2: Using `slice` and Array Spread**

* **Description**: The first slice creates a new array containing all elements up to the specified index (`index`). The second slice creates a new array containing all elements after the specified index (`index + 1`). These two slices are then spread into a new array, effectively removing the element at the original index.
* **Pros**:
	+ Can be faster due to not modifying the original array
	+ Suitable for large arrays or complex data structures
* **Cons**:
	+ Requires more memory allocation and copying of elements
	+ May have performance overhead due to function calls and array creation

**Library Used**

There is no explicit library mentioned in the benchmark definition. However, the `Array.prototype.slice()` method is used, which is a built-in method provided by JavaScript.

**Special JS Feature/Syntax**

The benchmark uses the spread operator (`...`) in the second test case. The spread operator was introduced in ECMAScript 2015 (ES6) as a way to create new arrays by copying elements from an existing array or other iterable. It's a convenient and efficient way to perform operations like concatenation, spreading, and destructuring.

**Other Alternatives**

If the benchmarkers wanted to explore alternative approaches, they could consider:

1. Using `Array.prototype.fill()` and `Array.prototype.forEach()`: Fill the array with a filler value (e.g., `null`), then use `forEach()` to remove elements at the specified index.
2. Using a library like Lodash or Underscore.js: These libraries provide utility functions for array manipulation, including ones that can remove elements from an array.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the original approaches tested by MeasureThat.net.

Related benchmarks:

remove element using splice slice vs spread slice (version: 0)

Comparing performance of: splice slice vs spread slice

Created: 3 years ago by: Registered User

Jump to the latest result

splice slice

spread slice

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):