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Slice vs Pop vs last item
(version: 0)
Comparing performance of:
Slice vs Pop vs Get last item
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = [1, 3, 5, 11, 13];
Tests:
Slice
arr.slice(0, -1);
Pop
arr.pop();
Get last item
arr[arr.length - 1]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Slice
Pop
Get last item
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided JSON defines a benchmarking test suite called "Slice vs Pop vs last item". The benchmark measures the performance of three different approaches to access the second-to-last element in an array: 1. `arr.slice(0, -1)` ( Slice) 2. `arr.pop()` ( Pop) 3. `arr[arr.length - 1]` ( Get last item) **Comparison of Options** The three options are compared as follows: * **Slice**: This approach creates a new array containing all elements except the last one using the `slice()` method. + Pros: Creates a new array with a specific subset of data, allowing for further processing on the resulting array. However, this approach may incur additional memory allocation and copying overhead. + Cons: May be slower than other approaches due to the creation of a new array. * **Pop**: This approach removes and returns the last element from the original array using the `pop()` method. + Pros: Fast and efficient, as it only modifies the original array. However, it may have performance implications when used on large arrays or in loops. + Cons: Modifies the original array, which can be undesirable for certain use cases. * **Get last item**: This approach accesses the last element of the array directly using array indexing (`arr[arr.length - 1]`). + Pros: Simple and fast, as it only requires a single operation to access the desired element. However, this approach assumes that the array is not modified during the execution. + Cons: May be slower than `pop()` if used in loops or with large arrays. **Library Usage** None of the individual test cases use any external libraries. The benchmarking test suite only relies on native JavaScript functionality. **Special JS Feature/Syntax** The test case "Slice" uses the `slice()` method, which is a built-in JavaScript method for creating a shallow copy of an array. This feature has been available since ECMAScript 5 (2011). **Other Alternatives** If you're looking for alternative approaches to access the second-to-last element in an array, consider: * Using `Array.prototype.at()` (ECMAScript 2020+): This method provides a safer and more efficient way to access elements at specific indices. * Utilizing `Array.prototype.slice.call()` with a negative index: This approach can be used as a fallback for older browsers or environments that don't support `at()`. * Implementing your own custom indexing solution using arithmetic operations. When choosing an approach, consider the trade-offs between memory allocation, array modification, and performance. The best option depends on the specific use case and requirements of your application.
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