Benchmark: Spread Splice vs Spread Push

Tests:

Splice
const empty = [] const toAdd = Array.from(Array(1000).keys()) empty.splice(0, 0, ...toAdd)
Push
const empty = [] const toAdd = Array.from(Array(1000).keys()) empty.push(...toAdd)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser/OS: Firefox 87 on Linux

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Test name	Executions per second
Splice	14169.8 Ops/sec
Push	29712.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Purpose**

The goal of this benchmark is to compare the performance of two ways to add elements to an empty array: using `Array.prototype.splice()` (Splice) and using `Array.prototype.push()` (Push).

**Options Compared**

Two options are compared:

1. **Splice**: Using the `splice()` method to add elements to an empty array.
2. **Push**: Using the `push()` method to add elements to an empty array.

**Pros and Cons of Each Approach**

* **Splice**:
	+ Pros: More flexible, allows for adding multiple elements at once, can be used with other array methods (e.g., `concat()`, `slice()`).
	+ Cons: Can be slower than `push()` due to the overhead of shifting elements in the array, can throw an error if not enough arguments are provided.
* **Push**:
	+ Pros: Faster, more straightforward, and easier to read.
	+ Cons: Limited to adding a single element at once, requires multiple pushes for adding multiple elements.

**Library Used**

There is no library explicitly mentioned in the benchmark definition. However, `Array.prototype` is used, which is a built-in JavaScript prototype that provides various methods for working with arrays.

**Special JS Feature or Syntax**

The test case uses the spread operator (`...`) to add elements to the array, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). The `Array.from()` method is also used, which is another modern JavaScript feature that creates a new array from an iterable.

**Other Considerations**

When choosing between `splice()` and `push()`, consider the following:

* Use `splice()` when you need to modify the array's size or when working with other array methods.
* Use `push()` when you only need to add elements to the end of the array and don't require any modifications.

**Alternatives**

Other alternatives for adding elements to an empty array include:

* Using a loop with `Array.prototype.push()`
* Creating a new array using `Array.from()` or `[...]` and then pushing elements
* Using other array methods, such as `concat()` or `slice()`, in combination with `push()`

It's worth noting that the choice of method ultimately depends on the specific use case and performance requirements.

Related benchmarks:

Spread Splice vs Spread Push (version: 0)

Comparing performance of: Splice vs Push

Created: 3 years ago by: Guest

Jump to the latest result

Splice

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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