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splice vs spread operator
(version: 0)
Comparing performance of:
splice vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
splice
var original = [0,1,2,3,4,5,7,8,9,10,12]; original.splice(6,0,6) original.splice(11, 0, 11);
spread operator
var original = [0,1,2,3,4,5,7,8,9,10,12]; original = [...original.slice(0,6), 6, ...original.slice(6,10), 11, original[10]];
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
splice
spread operator
Fastest:
N/A
Slowest:
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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. The benchmark is comparing two approaches: using the `splice` method and the spread operator (`...`) to modify an array in JavaScript. **What is being tested?** In the first test case, "splice", the code uses the `splice` method to remove elements from the end of the original array `original`. The `splice(6, 0, 6)` part removes elements starting from index 6 and inserts a new element at that position. The `splice(11, 0, 11)` part further modifies the array by removing elements up to index 10 and inserting a new element at index 10. In the second test case, "spread operator", the code uses the spread operator (`...`) to create a new array with modified elements. Specifically, it uses `original.slice(0,6), 6, ...original.slice(6,10), 11, original[10]` to split the original array into three parts: the first six elements, an array containing the number 6, the next five elements (from index 7 to 11), and the last element. **Options compared** The benchmark is comparing the performance of two approaches: 1. **Splice method**: This approach uses the `splice` method to directly modify the original array. 2. **Spread operator**: This approach creates a new array with modified elements using the spread operator (`...`). **Pros and cons of each approach:** **Splice method:** Pros: * It's a built-in JavaScript method that is well-supported by most browsers. * It allows for direct modification of the original array. Cons: * It can be slower than other methods, especially when dealing with large arrays, because it requires creating a new array and then copying the elements to the new position. * It can modify the original array's length if used incorrectly. **Spread operator:** Pros: * It's a relatively fast method that creates a new array without modifying the original one. * It's widely supported by modern browsers and JavaScript engines. Cons: * It requires creating a new array, which can be slower than using `splice`. * It might not work as expected if used incorrectly (e.g., with nested arrays). **Other considerations:** * The benchmark is running on a Chrome 114 browser, so any differences in performance might be due to the specific browser or JavaScript engine being used. * The test cases use a Windows platform and a desktop device, which might affect the results. In conclusion, this benchmark aims to compare the performance of two different approaches for modifying arrays in JavaScript: using the `splice` method versus the spread operator.
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