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Reducer push vs reducer spread
(version: 0)
Comparing performance of:
Spread vs Push
Created:
4 years ago
by:
Guest
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Tests:
Spread
let items = [ 'One', 'Two', 'Three']; let reducedItems = items.reduce((items, item) => ([...items, item]), []);
Push
let items = [ 'One', 'Two', 'Three']; let pushedItems = items.reduce((items, item) => { items.push(item); return items }, []);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
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 explain the JavaScript microbenchmark you provided. **Benchmark Definition** The benchmark measures the performance difference between two approaches: using `reduce` with an array spread (`[...items, item]`) versus pushing items onto an array using the `push()` method (`items.push(item)`). **Options Compared** Two options are being compared: 1. **Array Spread**: Using the spread operator `[...items, item]` to create a new array with the original elements and the newly added element. 2. **Push Method**: Using the `push()` method to add an element to the end of an array. **Pros and Cons** * **Array Spread**: + Pros: More concise and expressive code, avoids mutating the original array. + Cons: May have performance overhead due to creating a new array object. * **Push Method**: + Pros: More traditional and familiar approach, may be optimized by modern JavaScript engines. + Cons: Mutates the original array, which can lead to unexpected side effects. **Library Usage** None of the test cases use any external libraries. **Special JS Feature or Syntax** The benchmark uses the `reduce()` method, which is a built-in Array method that applies a user-defined function to each element in an array and reduces it to a single output value. The spread operator `[...items, item]` is also used within the callback function of `reduce()`, which is a modern JavaScript feature introduced in ECMAScript 2018. **Other Considerations** The benchmark measures the performance difference between these two approaches, which can be important when working with large datasets or performance-critical code. **Alternatives** If you need to create an array by appending elements to it, other alternatives include: * Using `concat()` method: `items.concat(item)` * Using `Array.prototype.push.apply()` method: `Array.prototype.push.apply(items, [item])` * Using a loop with a temporary variable: `let result = []; for (const item of items) { result.push(item); }` However, the spread operator `[...items, item]` is often considered a more concise and expressive way to create an array by appending elements.
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