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concat and push1
(version: 0)
Comparing performance of:
concat vs push
Created:
6 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script src=''></script>
Script Preparation code:
var arr1 = Array.from(Array(50000), (x,i) => i + 1) var arr2 = Array.from(Array(50000), (x,i) => i - 1)
Tests:
concat
arr1 = arr1.concat(arr2)
push
arr1.push(arr2)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
concat
push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two different methods for combining arrays in JavaScript: using the `concat()` method and using the `push()` method. Let's break down each approach: **1. `concat()` Method:** * **Description:** The `concat()` method creates a new array containing all elements from the original array(s) followed by the added elements. It doesn't modify the original arrays. * **Code Example:** `arr1.concat(arr2)` **Pros:** * Creates a completely new array, leaving the originals unchanged. This can be useful if you need to preserve the original data. * Relatively efficient for joining relatively small arrays. **Cons:** * Can be less performant than `push()` for larger arrays because it involves creating a new array object. * More memory intensive as a new array is created. **2. `push()` Method:** * **Description:** The `push()` method adds elements to the end of an existing array and returns the new length of the array. It modifies the original array directly. * **Code Example:** `arr1.push(arr2)` (This will add all elements from `arr2` to the end of `arr1`) **Pros:** * More efficient for larger arrays because it directly adds elements to an existing array, avoiding the overhead of creating a new one. * Can be memory-efficient as no new array is created. **Cons:** * Modifies the original array in place. This can be problematic if you need to preserve the original data structure. **Other Considerations:** * **Array Size:** For very large arrays, `push()` generally performs better due to its efficiency. * **Data Preservation:** If you need to maintain the original arrays, `concat()` is a safer choice. * **Memory Usage:** Be mindful of memory consumption, especially with large arrays. Let me know if you have any more questions or want to explore other JavaScript benchmark examples!
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