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Js push vs spread in create new array
(version: 0)
Comparing performance of:
spread vs push
Created:
4 years ago
by:
Registered User
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Tests:
spread
var arr = [1, 2, 3, 4, 5]; var out = arr.reduce((out, num) => { return [...out, num]; }, []);
push
var arr = [1, 2, 3, 4, 5]; var out = arr.reduce((out, num) => { out.push(num); return out; }, []);
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Suite status:
<idle, ready to run>
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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 help explain the JavaScript microbenchmark you've provided. **Benchmark Overview** The benchmark measures the performance difference between using the `push()` method versus the spread operator (`...`) when creating a new array and adding elements to it. **Options Compared** Two approaches are compared in this benchmark: 1. **`push()`**: This method adds an element to the end of an existing array. 2. **Spread Operator (`...`)**: This operator creates a new array by spreading out the elements of an existing array. **Pros and Cons of Each Approach** **`push()`**: Pros: * Simple and intuitive * No need to create a new array Cons: * Can be slower than using `spread` for large arrays, since it involves appending elements one by one. * May require more memory allocation if the array grows significantly. **Spread Operator (`...`)**: Pros: * Faster and more efficient for large arrays, as it creates a new array in a single operation. * More concise and readable code. Cons: * Requires creating a new array, which can be memory-intensive. * May have slower performance for small arrays due to the overhead of creating a new array. **Library/Dependency** None is mentioned in this benchmark. **Special JS Feature/Syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and has since become a standard feature in modern JavaScript. It allows for more concise and expressive code when working with arrays. **Other Alternatives** While the `push()` method is still widely used, alternative approaches to creating new arrays include: 1. **Array.prototype.concat()**: This method returns a new array containing all elements from the original array. 2. **Array.prototype.slice()**: This method returns a shallow copy of a portion of an array. 3. **Array.from()**: This method creates a new array from an iterable. In general, when choosing between these alternatives, consider factors such as performance, memory usage, and code readability. **Benchmark Preparation Code** Since the benchmark definition json doesn't provide any preparation code, it's assumed that no specific setup is required for the tests. The focus is solely on measuring the performance difference between the two approaches. Let me know if you have any further questions or need clarification!
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