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Array.from vs Spread 1k elements
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
5 years ago
by:
Guest
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Tests:
Array.from
var fooSet = new Set(); for(var i=0;i<1000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<1000;i++) { fooSet.add(i); } var other = [...fooSet];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.from
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net, which compares the performance of two approaches: using `Array.from()` and using the spread operator (`...`) to convert a Set object to an Array. **Options Compared** Two options are compared: 1. **Array.from()**: This method creates a new Array instance from an iterable or an array-like object. In this benchmark, it's used to create an Array from a Set object. 2. **Spread Operator (`...`)**: This operator is used to expand an iterable into individual elements. **Pros and Cons** * **Array.from()**: + Pros: - More explicit and readable code - Can be more efficient for large datasets, as it avoids the overhead of creating a new Array instance. + Cons: - May incur additional overhead due to the creation of a new Array instance. * **Spread Operator (`...`)**: + Pros: - More concise and expressive code - Can be faster for small datasets, as it avoids the overhead of creating a new Array instance. + Cons: - Less explicit and readable code - May incur additional overhead due to the creation of an intermediate array. **Other Considerations** * **Set Data Structure**: The benchmark uses a Set object to generate a large number of unique elements. Sets are optimized for fast lookups, insertions, and deletions, making them suitable for this use case. * **Browser Version and Platform**: The benchmark is run on Chrome 88 with a Mac OS X 10.15.7 platform, which may affect the performance results. **Library and Special JS Features** There are no external libraries used in this benchmark. However, it does utilize the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). **Benchmark Preparation Code** The preparation code is not provided in the JSON, but based on the benchmark definition, we can infer that it involves: 1. Creating a Set object with 1000 unique elements using `for` loop. 2. Using either `Array.from()` or the spread operator to convert the Set object to an Array. **Other Alternatives** If you need to compare these two approaches in different scenarios, here are some alternative benchmark ideas: * Compare performance for smaller datasets (e.g., 100-1000 elements). * Compare performance with different types of iterable objects (e.g., Arrays, Linked Lists, etc.). * Compare performance with different browser versions or platforms. * Compare performance with other Set-related methods, such as `Set.prototype.forEach()` or `Set.prototype.reduce()`.
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