Benchmark: pop vs length 123456 22

Tests:

length
const data = [1, 2, 3, 4]; return data[data.lenth - 1];
pop
const data = [1, 2, 3, 4]; return data.pop();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
length
pop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
length	17122492.0 Ops/sec
pop	27939792.0 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 on the provided JSON.

**Benchmark Definition**: The main goal of this benchmark is to compare the performance of two different ways to access the last element in an array: using `length` and `pop()` methods.

**Options compared**:

1. **Using `data.length - 1`**: This approach involves accessing the last index of the array using the `length` property, subtracting 1 from it, and then indexing into the array with that value.
2. **Using `data.pop()`**: This approach uses the `pop()` method to remove and return the last element from the array.

**Pros and Cons**:

* **Using `data.length - 1`**:
	+ Pros: Generally faster and more efficient, as it avoids the overhead of calling a method and modifying the array.
	+ Cons: May be less intuitive for developers who are not familiar with this approach.
* **Using `data.pop()`**:
	+ Pros: More intuitive and easier to understand, especially for those who are used to working with arrays in JavaScript.
	+ Cons: Generally slower due to the overhead of calling a method and modifying the array.

In general, using `data.length - 1` is a good choice when you need to access the last element of an array quickly and efficiently. However, if readability is more important than performance, `data.pop()` may be a better option.

**Other considerations**:

* Both approaches assume that the input array has at least one element.
* If the array can be empty or null, additional checks would need to be added to prevent errors.

**Library usage**: None of the provided benchmark definitions uses any external libraries.

**Special JavaScript features or syntax**: There are no special JavaScript features or syntax mentioned in these benchmarks. The code is standard JavaScript and only involves basic array operations.

Now, let's take a look at some other alternatives that could be used to measure the performance of accessing the last element of an array:

* Using `Array.prototype.at(-1)` (ES2019+): This method returns the last element of an array. It's generally faster than using `length - 1` and more readable than `pop()`.
* Using a custom loop: Instead of using one of these built-in methods, you could write a simple loop to iterate through the array and return the last element. This approach would be slower than the others but could be interesting for educational purposes.
* Measuring other methods: Depending on your specific use case, you might want to benchmark other ways of accessing the last element of an array, such as using `indexOf(-1)` or `slice().at(-1)`.

Related benchmarks:

pop vs length 123456 22 (version: 0)

asd asd asd asd asd

Comparing performance of: length vs pop

Created: 4 years ago by: Guest

Jump to the latest result

length

pop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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