Benchmark: Splice vs pop 2 - MeasureThat.net

Tests:

Pop
var abc = [1,2,3,4,5,6,7,8,9,10]; abc.pop(); abc.pop();
Splice
var abc = [1,2,3,4,5,6,7,8,9,10]; abc.splice(abc.length - 2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Pop
Splice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser/OS: Firefox 114 on Windows

View result in a separate tab

Test name	Executions per second
Pop	37117552.0 Ops/sec
Splice	13145313.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of two different approaches: using `pop()` versus `splice()`. Both methods are used to remove elements from an array in JavaScript. The test case creates an array `abc` with 10 elements, and then either removes the last two elements using `pop()` (twice) or uses `splice()` to remove the last two elements.

**Options Compared**

The benchmark compares the performance of:

1. **Pop**: Using `pop()` twice to remove the last two elements from the array.
2. **Splice**: Using `splice()` with an offset of `abc.length - 2` to remove the last two elements from the array.

**Pros and Cons of Each Approach**

### Pop

* Pros:
	+ Simple and concise implementation
	+ No need to manually manage index calculations
* Cons:
	+ Requires multiple function calls, which can lead to increased overhead due to function call costs
	+ May not be as efficient as other methods if the array is large or densely populated

### Splice

* Pros:
	+ More flexible and powerful than `pop()`, allowing for more complex removal scenarios
	+ Can reduce memory allocation and garbage collection overhead
* Cons:
	+ Requires manual index calculation, which can lead to performance issues if not done correctly
	+ May be slower than `pop()` due to the overhead of parsing the offset value

**Library Used**

In this benchmark, no external libraries are used.

**Special JS Features/Syntax**

The benchmark does not use any special JavaScript features or syntax beyond standard array methods. However, it's worth noting that modern browsers have various performance-related optimizations and caching mechanisms in place for array methods like `pop()` and `splice()`, which can affect their performance.

**Other Alternatives**

Some alternative approaches to removing elements from an array include:

1. **Shift()**: Similar to `pop()`, but shifts the remaining elements instead of removing them.
2. **Slice()**: Creates a new array with a subset of the original array's elements, allowing for more flexible removal scenarios.
3. **Array.prototype.slice.call(array).splice(index, length)`: This approach creates a new array and then uses `splice()` to modify it.

These alternatives may offer different performance profiles depending on the specific use case and implementation details.

Related benchmarks:

Splice vs pop 2 (version: 0)

Comparing performance of: Pop vs Splice

Created: 4 years ago by: Guest

Jump to the latest result

Pop

Splice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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