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Spread vs Slice in JS arrays
(version: 0)
Comparing performance of:
Spread vs Slice
Created:
3 years ago
by:
Guest
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Tests:
Spread
const a = Array.from({length : 50000}) const b = [...a]
Slice
const a = Array.from({length : 50000}) const c = 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 dive into the world of JavaScript microbenchmarks and explore what's being tested on this particular benchmark. **What is being tested?** The provided JSON represents two test cases: "Spread" and "Slice". The benchmark aims to measure the performance difference between using the spread operator (`...`) and the `slice()` method to create a new array from an existing one in JavaScript arrays. **Options compared** There are two options being compared: 1. **Spread Operator (`...`)**: This syntax creates a new array by copying elements from the original array. It's a concise way to achieve this result. 2. **Slice Method (`slice()`)**: This method returns a shallow copy of a portion of an array, specified by its start and end indices. **Pros and Cons** * **Spread Operator (`...`)**: + Pros: - Concise syntax - Fast and efficient - Works with arrays of any type (not just arrays) + Cons: - May cause confusion for beginners or those not familiar with it - Can lead to unexpected behavior if not used carefully (e.g., when dealing with objects or other data structures) * **Slice Method (`slice()`)**: + Pros: - Well-established and widely supported syntax - Provides more control over the resulting array (e.g., start and end indices can be adjusted) - Can be useful for manipulating arrays in specific ways + Cons: - Less concise than the spread operator - May be slower or less efficient than the spread operator, especially for large arrays **Library usage** None of the test cases uses any external libraries. The tests are pure JavaScript, relying on built-in functions and operators. **Special JS features or syntax** There is no special JavaScript feature or syntax being used in these test cases. They only employ standard JavaScript constructs and operators. **Other alternatives** If you're looking for alternative ways to create a new array from an existing one, some other options include: * `Array.prototype.concat()`: This method returns a new array containing the elements of the original array. * `Array.prototype.map()`: This method creates a new array with the results of applying a provided function to each element in the original array. * Using `for...of` loops or `reduce()` methods to iterate over the original array and construct a new one. However, it's worth noting that these alternatives might have different performance characteristics compared to the spread operator and slice method.
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