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Slice vs Pop copy 2
(version: 0)
Comparing performance of:
Slice vs Pop
Created:
3 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
var arr_pop = [...arr] arr_pop.pop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Slice
Pop
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** The provided JSON represents a JavaScript microbenchmark, specifically measuring the performance of two different approaches: using `Array.prototype.slice()` and using the spread operator (`...`) with array destructuring to create a new array without modifying the original. **Options being compared** Two options are being compared: 1. **`arr.slice(0, -1)`**: This approach uses the `slice()` method to create a new array containing all elements except the last one. 2. **`var arr_pop = [...arr]arr.pop();`**: This approach uses the spread operator (`...`) to create a copy of the original array, then calls `pop()` on the copy to remove the last element. **Pros and Cons** * **`arr.slice(0, -1)`**: + Pros: Simple and concise. The `slice()` method is widely supported and can be easily optimized by the browser. + Cons: Creates a new array, which may lead to unnecessary memory allocation. * **`var arr_pop = [...arr]arr.pop();`**: + Pros: Creates a shallow copy of the original array, reducing memory allocation compared to `slice()`. Also, it only removes one element at a time using `pop()`, which can be more efficient than removing all elements at once. + Cons: Requires creating a new array and calling `pop()` on it, adding complexity to the code. **Library usage** There is no explicit library used in this benchmark. However, some browser-specific features might be employed (e.g., Chrome 106), which we'll discuss later. **Special JavaScript feature or syntax** The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows creating new arrays from existing arrays by spreading elements. The `var arr_pop = [...arr]arr.pop();` approach uses this feature to create a copy of the array. **Other alternatives** For creating a shallow copy of an array without using spread operator, you can use other methods like: * **`Array.prototype.slice.call()`**: This method creates a new array by cloning the elements from the original array. * **`Array.from()`**: This method creates a new array from an iterable object (like an array). **Benchmark preparation code** The script preparation code `var arr = [1, 3, 5, 11, 13];\r\n` creates an array with 5 elements. The HTML preparation code is empty. **Device and browser specifics** The latest benchmark result shows that Chrome 106 on a desktop Windows platform has the highest execution rate for both test cases (`Pop` and `Slice`). This suggests that the browser's optimization of these two approaches might differ between devices and platforms.
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