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spread array performance (vs slice, splice, concat, from)
(version: 0)
Comparing performance of:
Splice vs Slice vs Concat vs Spread vs From
Created:
5 years ago
by:
Guest
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Tests:
Splice
const testArray = [1, 2, 3]; const newTestArray = testArray.splice(0);
Slice
const testArray = [1, 2, 3]; const newTestArray = testArray.slice();
Concat
const testArray = [1, 2, 3]; const newTestArray = testArray.concat();
Spread
const testArray = [1, 2, 3]; const newTestArray = [...testArray];
From
const testArray = [1, 2, 3]; const newTestArray = Array.from(testArray);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
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Test case name
Result
Splice
Slice
Concat
Spread
From
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 the provided JSON data and explain what's being tested, the options compared, pros and cons of each approach, and other considerations. **Benchmark Definition** The benchmark definition is a simple JavaScript snippet that creates an array `testArray` with three elements `[1, 2, 3]`. The script then uses different methods to create a new array `newTestArray`, which is supposed to be the same as `testArray`. Here's a brief description of each method: * **Splice**: Removes elements from the beginning of the array and returns an array with the removed elements. * **Slice**: Creates a shallow copy of the original array, starting from the specified index and ending at the specified end index (exclusive). * **Concat**: Concatenates two or more arrays into a new array. * **Spread**: Uses the spread operator (`...`) to create a new array with the same elements as the original array. * **From**: Creates an array from an iterable object, such as another array. **Options Compared** The benchmark compares the performance of each method in creating a new array that is identical to the original `testArray`. **Pros and Cons of Each Approach** Here's a brief overview of the pros and cons of each approach: * **Splice**: Pros: Can be used when you need to remove elements from an array. Cons: Returns the removed elements, which may not be what you want. * **Slice**: Pros: Creates a shallow copy of the original array. Cons: May not be suitable for arrays with large numbers of elements, as it can lead to performance issues. * **Concat**: Pros: Can concatenate multiple arrays into one. Cons: Requires creating an intermediate array, which can be inefficient. * **Spread**: Pros: Simple and efficient way to create a new array with the same elements as the original array. Cons: May not work well with large arrays or complex data structures. * **From**: Pros: Creates an array from an iterable object, making it suitable for converting other data structures into arrays. Cons: Requires using another function (e.g., `Array.from()`), which may add overhead. **Other Considerations** When choosing a method to create a new array, consider the following factors: * **Memory usage**: If you need to work with large arrays, slice or concat might not be suitable due to their memory-intensive nature. * **Performance**: Spread and from are generally faster than slice and concat for small to medium-sized arrays. However, for very large arrays, other methods might be more efficient. * **Data structure complexity**: If your data is complex (e.g., objects with nested properties), spread or from might not work well due to their limitations in handling complex data structures. **Library Usage** None of the benchmark's test cases explicitly use a library. However, if you consider the `Array.from()` function as part of the JavaScript standard library, it's worth noting that this function was introduced in ECMAScript 2015 (ES6) and provides a convenient way to create arrays from iterable objects. **Special JS Features or Syntax** There are no special JS features or syntax used in these test cases. The benchmark focuses on comparing different array methods using plain JavaScript code. Overall, the benchmark's goal is to provide insight into the performance characteristics of different array methods in creating new arrays that match the original data structure.
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Splice+Spread vs concat to concat arrays
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