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Iterator to Array Benchmark
(version: 0)
Comparing performance of:
Array.from vs spread vs push
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var map = new Map(Array.from({ length: 5000 }, (_, i) => [String(i + 1), { id: String(i + 1) }]));
Tests:
Array.from
const result = Array.from(map.values()); console.log(result);
spread
const result = [...map.values()]; console.log(result);
push
const result = []; for (const v of map.values()) { result.push(v); } console.log(result);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Array.from
spread
push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the JavaScript microbenchmark on MeasureThat.net. **Benchmark Overview** The Iterator to Array Benchmark measures how fast three different approaches are to convert an iterator (in this case, a Map) into an array in JavaScript. **Options Compared** The benchmark compares three different approaches: 1. **Array.from**: This method creates a new array from an iterable or an array-like object. It's a built-in method in JavaScript that uses iterators under the hood. 2. **Spread Operator (`...`)**: This syntax spreads the elements of an iterator (in this case, a Map) into separate arguments to a function, creating a new array. 3. **Manual Loop**: This approach uses a traditional `for...of` loop to iterate over the values of the iterator and push them onto an array. **Pros and Cons** Here's a brief summary of each approach: * **Array.from**: Pros: + Fast and efficient + Built-in method, so it's likely to be optimized by the browser + Easy to read and understand * Cons: + May not work as expected for certain iterator types (e.g., `Map`, which is used in this benchmark) * **Spread Operator (`...`)**: Pros: + Simple and concise syntax + Works with most iterator types, including `Map` * Cons: + May be slower than `Array.from` due to the overhead of creating a new array * **Manual Loop**: Pros: + Can be faster than `spread` for very large datasets + Works with any iterator type * Cons: + More verbose and harder to read than `Array.from` + May require more manual error handling **Library and Special JS Features** In this benchmark, the Map object is used as an iterator. The Map object is a built-in JavaScript data structure that stores key-value pairs. The spread operator (`...`) is also a built-in JavaScript syntax feature. It's not a library, but rather a language construct that allows you to create new arrays by spreading the elements of an existing array or iterable. **Other Considerations** When choosing between these approaches, consider the following factors: * Performance: If speed is critical, `Array.from` might be the best choice. For larger datasets, the manual loop might be faster. * Readability: If code readability is important, `Array.from` is likely a better option due to its concise and intuitive syntax. * Compatibility: Make sure the approach works with your specific use case and iterator type. **Alternatives** If you're interested in exploring alternative approaches, here are some options: * **IterableReduce**: This method applies a reduce function to an iterable and returns the accumulated value. It's similar to `Array.from`, but uses a different algorithm. * **iterableToArray**: This is a polyfill for older browsers that don't support `Array.from`. It provides a similar API, but with some differences in behavior. * **Other libraries or frameworks**: Depending on your specific use case and requirements, you might consider using a library like Lodash or Underscore.js to perform array conversions. I hope this explanation helps!
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Map vs Object with Number Keys
Iterating map v2
Map -> Array
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