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splice vs spread 10_23_2021
(version: 0)
Comparing performance of:
slice 10_23_2021 vs splice 10_23_2021
Created:
4 years ago
by:
Guest
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Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); } var idx = list.indexOf(1000);
Tests:
slice 10_23_2021
list = [ ...list.slice(0,idx), ...list.slice(idx + 1) ]
splice 10_23_2021
[...list].splice(idx,1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
slice 10_23_2021
splice 10_23_2021
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided JSON represents a benchmark definition, which outlines the test case and its requirements. In this case, we have two individual test cases: 1. `splice 10_23_2021`: This test case is designed to measure the performance of using `.splice()` method on an array. 2. `slice 10_23_2021`: This test case is designed to measure the performance of using `[...list].slice(idx)` or `list.slice(0, idx), list.slice(idx + 1)`, which is equivalent to creating a new array by spreading elements from two separate arrays. **Options Compared** In both test cases, we're comparing different approaches: * `.splice()` method on the original array * `[...list].slice(idx)` or `list.slice(0, idx), list.slice(idx + 1)`, which creates a new array and assigns it back to the `list` variable **Pros and Cons of Different Approaches** ### `.splice()` Method Pros: * Modifies the original array in-place, reducing memory allocation * Can be more efficient for large arrays since only a single operation is needed Cons: * May modify other parts of the code that rely on the original array's state * Can lead to unexpected behavior if not handled carefully ### `[...list].slice(idx)` or `list.slice(0, idx), list.slice(idx + 1)` Pros: * Creates a new array without modifying the original one, ensuring data integrity * Avoids potential issues with in-place modifications Cons: * Requires creating two separate arrays and copying elements from them, increasing memory allocation * May lead to slower performance due to additional memory allocations and copies **Library Usage** In this benchmark, we're using an external library ( likely the `Array.prototype` methods) for `.splice()` method implementation. The library ensures that the original array is modified in-place. **Special JS Feature/Syntax** None of the provided test cases use any special JavaScript features or syntax beyond what's standard for modern JavaScript engines. **Other Alternatives** If you're looking to optimize similar array operations, consider the following alternatives: * For `.splice()` method: + Using a `for...loop` instead of modifying the array in-place + Utilizing native Web Assembly (WASM) for optimized performance * For `[...list].slice(idx)` or `list.slice(0, idx), list.slice(idx + 1)`: + Using `Array.prototype.map()` and `Array.prototype.filter()` to create a new array instead of relying on `.splice()` + Leveraging the `Array.prototype.copyWithin()` method for more efficient element copying Keep in mind that these alternatives might introduce additional overhead or complexity, so it's essential to profile and benchmark your specific use cases to determine the most suitable approach.
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