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push or spread
(version: 0)
push or spread
Comparing performance of:
push vs spread
Created:
4 years ago
by:
Guest
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Tests:
push
let arr = []; for (let i = 0; i < 10; i++) { arr.push(i); }
spread
let arr = [] for (let i = 0; i < 10; i++) { arr= [...arr, i] }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
push
spread
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 what's being tested in the provided JSON. **What is being tested:** The website MeasureThat.net is testing two different approaches to push or spread elements onto an array in JavaScript: 1. **`arr.push(i)`**: This method uses the `push()` function, which adds one or more elements to the end of an array. 2. **`arr = [...arr, i]`**: This method uses the spread operator (`...`) and creates a new array by concatenating the existing array `arr` with a single element `i`. **Options compared:** The two approaches are being compared in terms of their performance. **Pros and Cons:** * **`arr.push(i)`**: + Pros: Simple, efficient, and widely supported. + Cons: Can be slower than the spread operator for large arrays due to the overhead of pushing elements onto the array's capacity. * **`arr = [...arr, i]`**: + Pros: Creates a new array, which can lead to better performance for large arrays since it avoids modifying the original array. Also, this approach is often preferred in functional programming because it does not mutate the original data. + Cons: Can be slower than `push()` for small arrays due to the overhead of creating a new array. Additionally, this approach creates an unnecessary copy of the original array. **Library and syntax considerations:** In this benchmark, there are no libraries or special JavaScript features being tested. **Other alternatives:** Before using either of these approaches, developers may also consider other options: * **`arr.concat(i)`**: This method is similar to `arr = [...arr, i]`, but it modifies the original array by adding a new element to its end. * **`Array.prototype.push.apply(arr, [i])`**: This method uses a helper function (`apply()`) to push multiple elements onto the array. These alternatives can be considered in specific use cases where the benefits of one approach outweigh the drawbacks of another.
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