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Arrary.from vs Spread Operator
(version: 0)
Comparing performance of:
Array.from vs Spread Operator
Created:
3 years ago
by:
Guest
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Tests:
Array.from
const a = [1,2,3,4,5,6,7,8,9,10]; Array.from(a);
Spread Operator
const a = [1,2,3,4,5,6,7,8,9,10]; [...a]
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.from
Spread Operator
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 specific benchmark. **Benchmark Definition** The provided JSON represents a benchmark definition for comparing two approaches: `Array.from()` and the spread operator (`[...]`). The benchmark aims to measure which approach is faster when creating an array from an existing array. **Options Compared** Two options are compared: 1. **`Array.from(a)`**: This method creates a new array by iterating over each element in the original array `a`. It's a more explicit way of creating an array. 2. **Spread Operator (`[...a]`)**: This operator creates a new array by spreading the elements of the original array `a`. **Pros and Cons** **`Array.from(a)`**: Pros: * More explicit and readable code * Can be useful when working with existing arrays or iterables * Allows for more control over the iteration process Cons: * May have performance overhead due to the iteration step * Can be slower than the spread operator in some cases **Spread Operator (`[...a]`)**: Pros: * More concise and efficient code * Often faster than `Array.from()` since it uses a single operation instead of an iteration loop * Simplifies code for many use cases Cons: * Less explicit and readable code (may require additional understanding of spread operator behavior) * Limited control over the iteration process **Library Considerations** There are no libraries used in this benchmark. **Special JS Feature or Syntax** None mentioned. The benchmark only focuses on comparing two basic JavaScript features: `Array.from()` and the spread operator. **Other Alternatives** If you were to add additional tests, some alternatives could be: 1. Using other array creation methods, such as: * `Array.prototype.slice(a)`: Creating a new array by slicing the original array. * `Array.prototype.map(a)`: Creating a new array by mapping over the original array and collecting the results. 2. Testing with different array sizes or characteristics (e.g., null, undefined, sparse arrays). 3. Comparing performance on other platforms or browsers. Keep in mind that this benchmark is focused specifically on comparing two approaches for creating an array from an existing array, so additional tests would need to be tailored to test these specific scenarios.
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