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at vs pop
(version: 0)
Comparing performance of:
pop vs at vs index
Created:
3 years ago
by:
Guest
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Script Preparation code:
arr = [0, 1, 2, 3]
Tests:
pop
arr.pop()
at
arr.at(-1)
index
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
pop
at
index
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and considered. **Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The goal is to measure the performance of different approaches for accessing an element in an array using two methods: `at()`, `pop()`, and indexing with square brackets (`[]`). **Script Preparation Code** The script preparation code is: ```javascript arr = [0, 1, 2, 3]; ``` This line creates a new JavaScript array `arr` containing four elements. **Html Preparation Code** There is no HTML preparation code provided, which means that the benchmark focuses solely on JavaScript performance. **Individual Test Cases** The benchmark consists of three test cases: 1. `arr.pop()`: Tests the performance of accessing an element from the end of the array using the `pop()` method. 2. `arr.at(-1)`: Tests the performance of accessing an element from the end of the array using the `at()` method with a negative index. 3. `arr[arr.length - 1]`: Tests the performance of indexing directly into the array using square brackets (`[]`) to access the last element. **Library and Special Features** There are no external libraries used in this benchmark, but we do see some special JavaScript features: * The `at()` method is used to access an element from the end of the array. This method was introduced in ECMAScript 2020 as a new way to access elements at specific indices. * Negative indexing is supported by both `pop()` and `at()`. This means that if you pass `-1` as the index, it will return the last element of the array. **Options Compared** The benchmark compares three approaches for accessing an element from the end of the array: 1. `arr.pop()`: Removes and returns the last element of the array. 2. `arr.at(-1)`: Returns the last element of the array without removing it. 3. Indexing with square brackets (`[]`): Directly accesses the last element of the array using `arr[arr.length - 1]`. **Pros and Cons** Here are some pros and cons for each approach: * `arr.pop()`: + Pros: Simple to use, efficient in terms of performance. + Cons: Removes the last element from the array, which can be a problem if you need to keep the entire array intact. * `arr.at(-1)`: + Pros: Returns the last element without removing it, which is useful for preserving the original array state. + Cons: Requires support for the new `at()` method, which may not be available in all browsers or environments. * Indexing with square brackets (`[]`): + Pros: Portable across different browsers and environments, does not require any additional libraries or methods. + Cons: Can be slower than using `pop()` or `at()`, especially for large arrays. **Other Alternatives** Some alternative approaches to accessing an element from the end of an array include: * Using a custom function to access elements at specific indices. * Using a different data structure, such as a linked list or a stack. * Avoiding indexing altogether and using other methods, such as `splice()` or `indexOf()`, to remove elements. However, these alternatives may not be as efficient or convenient as the approaches tested in this benchmark.
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