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Spread vs for with push
(version: 0)
Comparing performance of:
For with push vs Spread with push
Created:
7 years ago
by:
Guest
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Tests:
For with push
a = [1,2,3,4,5,6,7,8,9,10] b = [] a.forEach(a1 => b.push(a1))
Spread with push
a = [1,2,3,4,5,6] b = [] b.push(...a)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
For with push
Spread with 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 benchmark and its options. **What is tested?** The provided JSON represents a JavaScript microbenchmark that tests two approaches for adding elements to an empty array (`[]`): using `forEach` with `push` or using spread operator (`...`) with `push`. **Options compared:** There are two main options being compared: 1. **Using `forEach` with `push`:** * This approach iterates over the elements of the original array (`a`) and pushes each element to the target array (`b`). * The advantage is that it allows for more control over the iteration process, but may incur additional overhead due to function calls. 2. **Using spread operator (`...`) with `push`:** * This approach uses the spread operator to create a new array from the elements of `a`, and then pushes this new array to `b`. * The advantage is that it creates a new array, which can lead to performance benefits due to caching and vectorization optimizations in modern JavaScript engines. **Pros and Cons:** * **For with push:** + Pros: - More control over iteration process + Cons: - May incur additional overhead due to function calls - Can be slower due to the need for explicit loop control * **Spread with push:** + Pros: - Creates a new array, which can lead to performance benefits + Cons: - Requires the use of the spread operator, which may not be widely supported in older browsers - Can create temporary objects and arrays, which may not be desirable for memory-constrained applications **Library usage:** None of the provided benchmark code uses any external libraries. **Special JS features or syntax:** There are no special JavaScript features or syntax used in this benchmark. The focus is on comparing two basic array manipulation approaches. **Other alternatives:** If you were to design a more comprehensive benchmark, you might consider additional scenarios, such as: * Using `for` loops instead of `forEach` * Adding elements to an existing array instead of creating a new one * Using different data structures, such as objects or sets * Including browser-specific optimizations, such as WebAssembly or SIMD Keep in mind that the design of a benchmark should prioritize relevance and accuracy over comprehensiveness. The goal is to accurately compare different approaches and highlight their performance characteristics.
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