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slice vs. spread operator
(version: 0)
Comparing performance of:
spread vs slice
Created:
4 years ago
by:
Guest
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Tests:
spread
var a = [1, 2, 3, 4, 5, 6, 7, { a: 3 }]; var b = [...a];
slice
var a = [1, 2, 3, 4, 5, 6, 7, { a: 3 }]; var b = a.slice();
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Suite status:
<idle, ready to run>
Run tests (2)
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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 break down the benchmark and explain what is being tested. **Benchmark Definition** The benchmark measures the performance difference between two approaches: using the spread operator (`[...a]`) versus the `slice()` method to create a shallow copy of an array. **Options Compared** Two options are compared: 1. **Spread Operator**: The spread operator (`[...a]`) creates a new array by spreading the elements of the original array `a`. This approach is often used when creating a new array from an existing one, especially in modern JavaScript. 2. **Slice Method**: The `slice()` method returns a shallow copy of a portion of an array. In this case, it's used to create a new array by copying the entire original array `a`. **Pros and Cons** * **Spread Operator**: + Pros: Modern, concise, and efficient for creating new arrays. + Cons: May have performance overhead due to JavaScript engine optimizations, especially in older browsers or engines. * **Slice Method**: + Pros: Widely supported across different JavaScript engines and versions, potentially more efficient than spread operator in some cases. + Cons: Can be verbose and less modern-looking syntax. **Library and Purpose** There is no library used in this benchmark. The benchmark focuses solely on the performance comparison between two built-in JavaScript features. **Special JS Feature or Syntax** The benchmark does not use any special JavaScript features or syntax that would require additional explanation. **Other Alternatives** If you're interested in exploring other array creation methods, here are a few alternatives: * **Array.from()**: This method creates a new array from an iterable. It's often used when working with older browsers or engines that don't support the spread operator. * **concat()**: This method concatenates two or more arrays and returns a new array. It's less efficient than the spread operator but can be useful in certain scenarios. In conclusion, this benchmark provides a simple yet informative comparison of two common array creation methods in JavaScript: the spread operator and the `slice()` method. The results help users understand the performance implications of choosing one approach over the other in different scenarios.
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