Benchmark: splice vs double pop

Script Preparation code:

var list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}

Tests:

splice
list = list.splice(list.length-2,2)
double pop
list.pop() list.pop()

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

double pop

167.0M/s

splice

5.7M/s

Fastest: double pop (29.5x faster)

View exact numbers

✓ double pop: 166,962,688 ops/sec
• splice: 5,666,778 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
splice
double pop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 15 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36

Browser/OS: Chrome 150 on Windows

View result in a separate tab

double pop

458.2M/s

splice

5.1M/s

View exact numbers

Test name	Executions per second
✓ double pop	458,153,600 Ops/sec
splice	5,073,944 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark measures the performance of two different approaches:

1. **`list.splice(list.length-2,2)`**: This method removes two elements from the end of the list.
2. **`list.pop() list.pop()`**: This approach pops two elements from the list.

Both methods are used to remove a specified number of elements from the list.

**Options Compared**

The benchmark compares the performance of these two different approaches:

* `splice`: Removes elements from the list using the `splice` method.
* `double pop`: Pops two elements from the list using the `pop` method twice in a row.

**Pros and Cons**

Here are some pros and cons for each approach:

* **`splice`**:
	+ Pros: More efficient than popping multiple times, as it only requires a single operation to remove elements.
	+ Cons: May have an initial overhead due to the need to calculate indices.
* **`double pop`**:
	+ Pros: Simple and easy to understand, no need to calculate indices.
	+ Cons: Requires two separate operations (popping), which can be slower than a single operation like `splice`.

**Library**

There is no explicit library mentioned in the benchmark definition. However, the use of `list.splice` and `list.pop` suggests that the test is using built-in JavaScript methods.

**Special JS Feature or Syntax**

The test case uses two special JavaScript features:

* **Array.prototype.splice**: The `splice` method modifies the original array and returns an array with the removed elements.
* **Array.prototype.pop**: The `pop` method removes and returns the last element of the array, modifying the original array.

These features are widely supported in modern JavaScript environments.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* **Using `slice` instead of `splice`**: You could use the `slice` method to remove elements from the list. However, this would require more code and might not be as efficient.
* **Using `filter` or `map`**: You could also use other array methods like `filter` or `map` to achieve the same result. For example, using `filter` with a callback function to create a new array without the removed elements.

However, these alternatives would likely be less efficient than using `splice` or popping multiple times.

Overall, the benchmark provides a simple and straightforward way to compare the performance of two different approaches: removing elements from an array using `splice` versus using `pop` twice.

splice vs double pop (version: 0)

100k list

Comparing performance of: `splice vs double pop`

Created: 3 years ago by: Guest

Go to the latest result

splice

double pop

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

splice vs double pop (version: 0)

100k list

Comparing performance of: splice vs double pop

Created: 3 years ago by: Guest

Go to the latest result

splice

double pop

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 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: `splice vs double pop`