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spread vs concat vs unshift vs push+sort
(version: 0)
spread vs concat vs unshift vs push+sort
Comparing performance of:
arrayUnshift123 vs arrayConcat123 vs arraySpread123 vs arrayPush+sort
Created:
6 years ago
by:
Guest
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Script Preparation code:
var array = new Array(); for (let i = 1; i <= 1000; i++) { array.push(i); }
Tests:
arrayUnshift123
array.unshift(0);
arrayConcat123
array = array.concat([0])
arraySpread123
array = [0, ...array]
arrayPush+sort
array.push(0) array.sort()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
arrayUnshift123
arrayConcat123
arraySpread123
arrayPush+sort
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. The benchmark is designed to compare the performance of different array manipulation methods: `unshift`, `concat`, `spread` (using the spread operator), and `push+sort`. **Options Compared:** 1. **`array.unshift(0)`**: This method appends a new element to the beginning of the array. 2. **`array.concat([0])`**: This method creates a new array by concatenating the original array with a new array containing a single element (in this case, `0`). 3. **`array = [0, ...array]`**: This method uses the spread operator to create a new array that includes the elements of the original array followed by the value `0`. 4. **`array.push(0)\r\narray.sort()`**: This method pushes the value `0` onto the end of the array and then sorts the entire array in ascending order. **Pros and Cons:** * **`unshift` Method:** Efficient when adding elements to the beginning of an array, as it only needs to shift existing elements down. However, it may not be suitable for large arrays due to the overhead of shifting elements. * **`concat` Method:** Less efficient than `push+sort` because creating a new array requires additional memory allocation and copying data. On the other hand, it is useful when you need to merge two or more arrays. * **`spread` Method:** Creates a new array without modifying the original one, which can be beneficial in certain scenarios where preserving the original array's state is necessary. However, creating a new array using `...array` may incur additional memory allocation and copying data. * **`push+sort` Method:** The least efficient option among these four methods because it involves not only pushing an element onto the end of the array but also sorting the entire array in the process. This can be expensive for large arrays. **Library:** There is no explicit library mentioned in the provided JSON, but the use of `push`, `sort`, and `concat` suggests that JavaScript's built-in array methods are being used. **Special JS Feature/Syntax:** The spread operator (`...array`) introduced in ECMAScript 2015 (ES6) allows creating a new array by including elements from an existing array. This feature is not mentioned in the provided JSON, but it is an essential aspect of modern JavaScript development. **Other Alternatives:** When dealing with large arrays or performance-critical applications, other array manipulation methods like `splice` or using a library like Lodash might be more suitable. However, these alternatives are not explicitly mentioned in the provided JSON and would require additional setup and consideration. **Benchmark Preparation Code Explanation:** The script preparation code creates an empty array (`var array = new Array();`) and then populates it with values from 1 to 1000 using a `for` loop (`array.push(i);`). This creates a large dataset for the benchmark, allowing for accurate performance comparisons among different array manipulation methods. **Individual Test Cases:** Each test case represents a specific array manipulation method being tested. For example, the first test case (`"array.unshift(0);"`) measures the time it takes to append `0` to the beginning of an empty array using the `unshift` method. Similar logic applies to the other test cases. In summary, this benchmark tests the performance of different array manipulation methods in JavaScript: `unshift`, `concat`, `spread`, and `push+sort`. Each method has its pros and cons, and understanding these differences is essential for selecting the most suitable approach depending on your specific use case.
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