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Spread performance
(version: 0)
Comparing performance of:
No Spread vs Spread
Created:
7 years ago
by:
Guest
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Tests:
No Spread
const arr = [1, 2, 3, 4, 5]; const set = new Set(arr); for (let i = 0; i < arr.length; i++) { console.log(arr[i]); }
Spread
const arr = [1, 2, 3, 4, 5]; const set = new Set(arr); const nums = [...set[Symbol.iterator]()]; for (let i = 0; i < nums.length; i++) { console.log(nums[i]); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
No Spread
Spread
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 provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark measures the performance of creating a Set from an array using two different approaches: 1. **No Spread**: Directly creating a new Set object by passing the array literal `[1, 2, 3, 4, 5]` to the `Set()` constructor. 2. **Spread**: Using the spread operator (`...`) to create a new array from the iterator of the original Set. **Options Compared** The two approaches are being compared to determine which one is more efficient in terms of performance (measured by the number of executions per second). **Pros and Cons of Each Approach** 1. **No Spread**: * Pros: Simple, straightforward, and likely to be optimized by most JavaScript engines. * Cons: May require more memory allocations or copying of elements, which can lead to slower performance. 2. **Spread**: * Pros: Can potentially reduce memory allocations and copying of elements, leading to faster performance. * Cons: May introduce additional overhead due to the creation of a new array. **Library Used** None is explicitly mentioned in this benchmark. However, it's worth noting that Sets are built-in data structures in JavaScript, so no external library is required. **Special JS Feature or Syntax** The spread operator (`...`) is used to create a new array from the iterator of the original Set. This syntax is supported in modern JavaScript versions and allows for more concise and expressive code. **Other Alternatives** There might be other ways to create a Set from an array, such as using the `Array.from()` method or implementing a custom function. However, these alternatives are not being compared in this benchmark. In summary, the benchmark measures the performance of two approaches when creating a Set from an array: 1. Directly passing the array literal to the `Set()` constructor (no spread). 2. Using the spread operator to create a new array from the iterator of the original Set (spread). By comparing these two approaches, the benchmark aims to determine which one is more efficient in terms of performance.
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