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Spread vs slice test
(version: 0)
Comparing performance of:
Spread vs Slice
Created:
6 years ago
by:
Guest
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Tests:
Spread
const foo = [1,2,3,4,5]; const spread = [...foo];
Slice
const foo = [1,2,3,4,5]; const slice = foo.slice();
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Suite status:
<idle, ready to run>
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Test case name
Result
Spread
Slice
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 benchmarks! **What is being tested?** The provided benchmark tests two approaches to create a new array from an existing one: using the spread operator (`...`) and the `slice()` method. **Options compared:** * Spread operator (`...`): creates a new array by copying elements from the original array. * `slice()` method: returns a shallow copy of a portion of an array. **Pros and Cons:** * **Spread Operator (`...`)**: + Pros: - Creates a new, independent array, which can be useful for immutable data structures or when working with functions that take arrays as arguments. - Can be more readable in some cases, especially when creating complex spreads. + Cons: - Can create unnecessary memory allocations if not used carefully. - May be slower than `slice()` due to the overhead of creating a new array. * `slice()` method: + Pros: - Generally faster than the spread operator because it creates a shallow copy without allocating new memory. - Often preferred for performance-critical code or when working with large arrays. + Cons: - Can return a reference to the original array if not used carefully (e.g., `slice(0)` returns an empty array). - May not be as readable in some cases, especially when creating complex slices. **Library:** None, just built-in JavaScript functionality. **Special JS feature/syntax:** The benchmark uses spread operator (`...`) and `slice()` method, both of which are standard JavaScript features. No special syntax or features are used here. **Other alternatives:** * `Array.prototype.concat()`: creates a new array by copying elements from the original array. * `Array.prototype.map()`: creates a new array with transformed elements (not applicable in this case). * Other libraries or frameworks may have optimized implementations of these operations, but the benchmark is designed to compare built-in JavaScript methods. Keep in mind that these alternatives may offer different trade-offs in terms of performance, memory usage, and readability, depending on the specific use case.
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