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push vs spread vs concat irek
(version: 0)
Comparing performance of:
push vs spread vs concat
Created:
6 years ago
by:
Guest
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Tests:
push
const a = [1,2,3]; const b = [4,5,6]; a.push(...b);
spread
const a = [1,2,3]; const b = [4,5,6]; const c = [...a, ...b]
concat
const a = [1,2,3]; const b = [4,5,6]; const c = a.concat(b)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
push
spread
concat
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 this benchmark. **What is being tested?** The benchmark is comparing three ways to concatenate (join) two arrays: `push`, `spread`, and `concat`. The test cases are identical, except for the method used to concatenate the arrays. **Options compared** * `push`: Using the `push()` method with the spread operator (`...`) to append elements from one array to another. * `spread`: Using the spread operator (`...`) alone to create a new array by spreading the elements of another array. * `concat`: Using the `concat()` method, which returns a new array containing the elements of both input arrays. **Pros and Cons** * **push**: Pros: + Fastest, since it only requires a single operation (appending an element to the end of the array). + Simple and easy to understand. * Cons: + May not be as efficient for large arrays, since it requires multiple push operations. + Can lead to performance issues if the array grows too large. * **spread**: Pros: + Efficient for large arrays, since it only requires a single operation (spreading elements into a new array). + Supports more use cases than `push`, such as creating a new array with an initial value. * Cons: + May have performance overhead due to the creation of a new array. + Can be less readable for complex scenarios. * **concat**: Pros: + Easy to understand and maintain, since it clearly separates the source arrays. + Supports more use cases than `push`, such as creating a new array with multiple input arrays. * Cons: + May have performance overhead due to the creation of a new array. + Can lead to performance issues if the arrays are very large. **Libraries and special features** There is no library used in this benchmark. No special JavaScript features or syntax are mentioned. **Other alternatives** Other methods for concatenating arrays include: * Using `array.prototype.reduce()` with an initial value: `[...a, ...b].reduce((acc, val) => [...acc, val], [])` * Using `Array.from()` and `Array.prototype.concat()`: `Array.from(a, () => a).concat(Array.from(b, () => b))` * Using `Array.prototype.map()` and `Array.prototype.concat()`: `a.map(() => b).concat(a)` These alternatives may have different performance characteristics and use cases compared to the methods being tested in this benchmark. Keep in mind that the performance difference between these methods is usually negligible for small arrays, but can become significant when dealing with large datasets. The choice of method ultimately depends on the specific requirements of your project and personal preference.
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