Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Last with slice, pop vs index
(version: 0)
Comparing performance of:
Slice and Pop vs Slice and index
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = [1, 3, 5, 11, 13];
Tests:
Slice and Pop
arr.slice(-1).pop();
Slice and index
arr.slice(-1)[0];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Slice and Pop
Slice and index
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition:** The benchmark is designed to measure the performance difference between two approaches: 1. Using `slice(-1).pop()` (Test Name: "Slice and Pop") 2. Using `slice(-1)[0]` (Test Name: "Slice and index") In essence, both approaches are used to extract the last element from an array (`arr`) using the `slice` method. **Options Compared:** The two options being compared are: * `slice(-1).pop()` * `slice(-1)[0]` These two approaches have different performance characteristics: * `slice(-1).pop()`: + Creates a new array object with only the last element (which involves copying the entire slice). + Then, calls the `pop()` method on that new array object to remove and return the last element. + This approach creates an extra object in memory, which can lead to higher overhead due to object creation and garbage collection. * `slice(-1)[0]`: + Returns a single value, the last element of the slice, without creating a new array object. + This approach is more direct and efficient, as it only returns a single value without the need for an intermediate object. **Pros and Cons:** * `slice(-1).pop()` + Pros: - May be more concise and readable for some developers. + Cons: - Creates an extra object in memory, leading to higher overhead. * `slice(-1)[0]` + Pros: - More efficient, as it only returns a single value without creating an intermediate object. + Cons: - May be less readable for some developers due to the use of indexing instead of method chaining. **Library Usage:** None of the provided benchmark definitions uses any external libraries. The `slice` method is a built-in JavaScript method, and the `pop()` method is also a built-in JavaScript method. **Special JS Feature or Syntax:** There are no special JS features or syntax used in these benchmark definitions. They only use standard JavaScript methods and operators. **Alternatives:** If you want to explore alternative approaches for extracting the last element from an array, here are some options: * Using `at()` (ECMAScript 2019): `arr.at(-1)` returns a reference to the last element of the array. * Using `reduce()` with an initial value of 0: `arr.reduce((a, b) => b - a, 0)` can be used to find the last element in the array. These alternatives might offer better performance or readability for specific use cases, but they may also introduce new overheads or complexities.
Related benchmarks:
Slice vs Pop vs last item
Array Slice vs Pop
Slice vs Pop vs At(-1)
Last element slice vs pop
Comments
Confirm delete:
Do you really want to delete benchmark?