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Spread vs Concat
(version: 0)
Comparing performance of:
Spread vs Concat
Created:
8 years ago
by:
Guest
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Tests:
Spread
arr1 = [1, 2, 4] arr2 = ['a', 'b', 'c'] arr3 = [...arr1, ...arr2]
Concat
arr1 = [1, 2, 4] arr2 = ['a', 'b', 'c'] arr3 = arr1.concat(arr2)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread
Concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two methods for concatenating arrays in JavaScript: the spread operator (`...`) and the `concat()` method. **Here's a breakdown:** * **Spread Operator (`...`)**: This approach uses the spread operator to expand the elements of `arr1` and `arr2` into a new array `arr3`. * **Pros**: Generally considered more concise and readable. Often performs better in modern JavaScript engines due to optimizations. * **Cons**: Can potentially create unnecessary intermediate arrays depending on the engine implementation. * **`concat()` Method**: This method takes one or more arrays as arguments and returns a new array containing all the elements from the input arrays. * **Pros**: Well-established and familiar to many developers. Works reliably across different JavaScript environments. * **Cons**: Can be more verbose than the spread operator. Performance may not be as optimized in some cases. **Alternatives:** While `concat()` and the spread operator are common, there are other ways to achieve array concatenation: * **Array literals**: Manually listing elements within square brackets (`[1, 2, 4, 'a', 'b', 'c']`). This is simple for small arrays but can become cumbersome for larger ones. * **`push()` Method**: You can use `push()` to add elements to the end of an existing array. This is efficient for adding individual elements, but not ideal for concatenating multiple arrays at once. **Important Notes:** * The benchmark results you provided show that the spread operator (`...`) was slightly faster in this particular test case. However, performance can vary depending on factors like the size of the arrays, the JavaScript engine being used, and other code running concurrently. * It's crucial to remember that benchmarks should be interpreted with caution. They provide a snapshot of performance under specific conditions and may not always reflect real-world usage scenarios. Always consider factors beyond raw speed, such as readability and maintainability.
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