Benchmark: Slice vs Pop - MeasureThat.net

Script Preparation code:

var arr = [1, 3, 5, 11, 13];

Tests:

Slice
arr.slice(0, -1);
Pop
arr.pop();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
Pop

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser/OS: Firefox 144 on Linux

View result in a separate tab

Test name	Executions per second
Slice	29429070.0 Ops/sec
Pop	153144704.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this JavaScript microbenchmark.

**Benchmark Definition JSON**

The provided JSON defines two benchmark tests:

1. **Slice vs Pop**: This is the main benchmark, which compares the performance of `Array.prototype.slice()` and `Array.prototype.pop()` methods.
2. The script preparation code creates an array `arr` with a few elements: `[1, 3, 5, 11, 13]`.
3. There's no HTML preparation code provided.

**Options Compared**

The benchmark tests two options:

a. **Pop**: This method removes and returns the last element from the array.
b. **Slice**: This method creates a new array containing all elements from the original array, excluding the specified end index.

**Pros and Cons of Each Approach**

1. **Pop**:
	* Pros:
		+ More intuitive for removing the last element.
		+ Less memory allocation overhead compared to `slice()`.
	* Cons:
		+ Returns a value (the removed element), which might be unwanted in some scenarios.
		+ Can lead to unexpected side effects if not used carefully.
2. **Slice**:
	* Pros:
		+ More flexible, as it creates a new array without modifying the original one.
		+ Does not return a value, making it safer to use.
	* Cons:
		+ Requires more memory allocation and processing power compared to `pop()`.
		+ Can be slower due to the overhead of creating a new array.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition. However, some JavaScript engines might provide additional optimizations or features that could affect the performance of these methods.

**Special JS Feature/Syntax**

None are explicitly mentioned. If any special features or syntax were used, it would be interesting to explore how they impact the benchmark results. However, based on the provided code and options, we can focus on the standard JavaScript methods `pop()` and `slice()`.

**Other Alternatives**

For large arrays, you might consider using:

1. **Array.prototype.indexOf()` or `Array.prototype.findIndex()` for finding a specific element, followed by slicing or removing that element.
2. **Array.prototype.splice()` to replace an element at a specified index.

Keep in mind that these alternatives might not provide identical performance characteristics as the original methods.

**Notes**

The benchmark results provided are from Firefox 130 on a Linux desktop, with execution counts per second for each test case. This data will help identify which method is faster and more efficient for specific use cases.

Related benchmarks:

Slice vs Pop (version: 0)

Comparing performance of: Slice vs Pop

Created: 6 years ago by: Guest

Jump to the latest result

Slice

Pop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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