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Create Set vs loop
(version: 0)
Comparing performance of:
Create Set vs Loop array
Created:
4 years ago
by:
Guest
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Script Preparation code:
var arr = Array(9007199).fill(2)
Tests:
Create Set
const _set = new Set(arr)
Loop array
for ( let i = 0; i < arr.length; i++ ) { }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Create Set
Loop array
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 JSON and explain what's being tested in this JavaScript microbenchmark. **What is being tested?** The benchmark tests two approaches to create an array of 9,000,001 elements with a value of 2: 1. **Create Set**: This approach creates a new `Set` instance (`const _set = new Set(arr)`). A `Set` in JavaScript is an unordered collection of unique values. 2. **Loop array**: This approach uses a traditional for loop to iterate over the array and add each element to the result (although, in this case, it doesn't actually create anything). **Options compared** The two options are: * Creating a new `Set` instance * Using a traditional for loop to iterate over the array **Pros and cons of each approach** * **Create Set**: Pros: + Efficiently creates an unordered collection of unique values. + Can be faster than iterating over the array, especially when dealing with large datasets. * Cons: + May not be suitable for use cases that require a traditional ordered array or specific ordering. + Some browsers may have performance issues with `Set` instances. * **Loop array**: Pros: + Suitable for use cases that require a traditional ordered array or specific ordering. + Well-supported in most browsers. * Cons: + Can be slower than creating a new `Set` instance, especially when dealing with large datasets. **Library and purpose** In this case, no external library is required. The built-in `Set` data structure is used to create the unordered collection of unique values. **Special JS feature or syntax** None mentioned in this benchmark definition. However, it's worth noting that using `Set` instances can be affected by browser-specific implementations and optimizations. **Other alternatives** If you needed to iterate over an array without creating a new set, alternative approaches could include: * Using the `for...in` loop with `arr[Symbol.iterator]()` * Using a library like Lodash or Ramda * Utilizing other data structures, such as arrays or linked lists However, in this specific benchmark, creating a new `Set` instance is likely to be faster and more efficient.
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