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();

Historical Performance Data aggregated from 71 community runs

Desktop Results:

Chrome 48 runs

Pop

29.0M/s

Slice

20.2M/s

Fastest: Pop (1.4x faster)

View exact numbers

✓ Pop: 29,002,280 ops/sec
• Slice: 20,207,884 ops/sec

Firefox 23 runs

Pop

191.1M/s

Slice

36.6M/s

Fastest: Pop (5.2x faster)

View exact numbers

✓ Pop: 191,149,216 ops/sec
• Slice: 36,610,036 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

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: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:153.0) Gecko/20100101 Firefox/153.0

Browser/OS: Firefox 153 on Windows

View result in a separate tab

Pop

148.8M/s

Slice

33.7M/s

View exact numbers

Test name	Executions per second
✓ Pop	148,767,696 Ops/sec
Slice	33,695,584 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.

Slice vs Pop (version: 0)

Comparing performance of: `Slice vs Pop`

Created: 6 years ago by: Guest

Go to the latest result

Slice

Pop

Historical Performance Data aggregated from 71 community runs

Desktop Results:

Chrome 48 runs

Firefox 23 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Slice vs Pop (version: 0)

Comparing performance of: Slice vs Pop

Created: 6 years ago by: Guest

Go to the latest result

Slice

Pop

Historical Performance Data aggregated from 71 community runs

Desktop Results:

Chrome 48 runs

Firefox 23 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `Slice vs Pop`