Benchmark: remove last array element (slice vs splice vs length vs pop)

Tests:

slice
let test_array = [1, 2, 3, 4]; test_array.slice(0, 3);
splice
let test_array = [1, 2, 3, 4]; test_array.splice(3, 1);
length
let test_array = [1, 2, 3, 4]; test_array.length = 3;
pop
let test_array = [1, 2, 3, 4]; test_array.pop();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
splice
length
pop

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
slice	24587666.0 Ops/sec
splice	16281201.0 Ops/sec
length	10719887.0 Ops/sec
pop	43813216.0 Ops/sec

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

LLMs can make mistakes. Check important info.

**Benchmark Description**

The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of four different approaches to removing the last element from an array in JavaScript.

**Test Cases**

There are four individual test cases:

1. **Slice**: `test_array.slice(0, 3);`
2. **Splice**: `test_array.splice(3, 1);`
3. **Length**: `test_array.length = 3;`
4. **Pop**: `test_array.pop();`

**Options Compared**

The test cases compare four different approaches to remove the last element from an array:

* **Slice (0, 3)**: This approach uses the `slice()` method with start and end indices to create a new array without the last element.
* **Splice (3, 1)**: This approach uses the `splice()` method to remove one element at index 3, effectively removing the last element from the original array.
* **Length = 3**: This approach sets the length property of the array to 3, which removes the last element by truncating the array's size.
* **Pop**: This approach uses the `pop()` method to directly remove and return the last element from the array.

**Pros/Cons**

Here are some pros and cons for each approach:

* **Slice (0, 3)**:
	+ Pros: creates a new array without modifying the original one, which can be useful in certain scenarios.
	+ Cons: creates a new array, which can lead to performance issues if working with large arrays.
* **Splice (3, 1)**:
	+ Pros: modifies the original array, which can be beneficial when working with large datasets.
	+ Cons: can be slower than other approaches due to the overhead of modifying the array's internal state.
* **Length = 3**:
	+ Pros: simple and efficient approach that directly modifies the array's size.
	+ Cons: does not return the removed element, which may not be desirable in some cases.
* **Pop**:
	+ Pros: returns the removed element, which can be useful when working with arrays of objects or complex data structures.
	+ Cons: modifies the original array and only returns a single value.

**Other Considerations**

When choosing an approach, consider the following:

* Performance: If you're working with large datasets, **splice (3, 1)** might be slower than other approaches due to the overhead of modifying the array's internal state.
* Data integrity: If you need to preserve the original array and its contents, **slice (0, 3)** or **pop** might be better options.

No external libraries or special JavaScript features are used in this benchmark test case. The results show that **pop** is the fastest approach on Chrome 97, followed by **splice (3, 1)**, then **length = 3**, and finally **slice (0, 3)**.

Other alternatives to consider when removing elements from an array include:

* Using `filter()` method with a callback function
* Utilizing JavaScript's destructuring syntax to create new arrays without modifying the original one

Related benchmarks:

remove last array element (slice vs splice vs length vs pop) (version: 0)

Comparing performance of: slice vs splice vs length vs pop

Created: 4 years ago by: Guest

Jump to the latest result

slice

splice

length

pop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):