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Concat v Push
(version: 0)
Comparing performance of:
Concat vs Push
Created:
7 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
emptyArray = []; flatMapConcat = f => xs => xs.reduce((r, x) => r.concat(f(x)), emptyArray); flatMapPush = f => xs => xs.reduce((r, x) => { f(x).forEach(y => {r.push(y)}) return r; }, []); inc = x => [x, x + 1]; arr = Array(1000).fill(1);
Tests:
Concat
r1 = flatMapConcat(inc)(arr)
Push
r2 = flatMapPush(inc)(arr)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Concat
Push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON and explain what's being tested, compared, and other considerations. **Benchmark Definition** The benchmark is comparing two approaches to concatenate arrays in JavaScript: `flatMapConcat` and `flatMapPush`. The script preparation code defines these two functions: * `flatMapConcat`: takes a function `f` and an array `xs`, and returns a new array with the result of applying `f` to each element of `xs`, concatenated together. * `flatMapPush`: takes a function `f` and an array `xs`, and returns a new array by pushing the result of applying `f` to each element of `xs` into a new array. **Options Compared** The benchmark is comparing two options: 1. **Concatenation using `flatMapConcat`**: This approach uses the `reduce()` method to concatenate the arrays. 2. **Pushing elements into an array using `flatMapPush`**: This approach iterates over each element of the original array, applies the function `f`, and pushes the result into a new array. **Pros and Cons** * **flatMapConcat**: + Pros: Can be more efficient for large arrays since it uses a single `reduce()` operation. + Cons: Requires a function that returns an array (e.g., `[1, 2]`) to be concatenated together, which can lead to unnecessary object creation. * **flatMapPush**: + Pros: Does not require the return value of the function to be an array, and it avoids creating intermediate arrays. + Cons: Iterates over each element twice (once for `forEach()` and once for `push()`), leading to a higher number of operations. **Library** The benchmark uses the `Array` class, which is part of the JavaScript standard library. The `Array` class provides methods like `fill()`, `reduce()`, and `forEach()` that are used in the script preparation code. **Special JS Feature/Syntax** There is no special JavaScript feature or syntax used in this benchmark. It only relies on basic JavaScript concepts, such as functions, arrays, and loops. **Other Alternatives** If you're interested in exploring alternative approaches to concatenating arrays, here are a few options: * Using `Array.prototype.concat()` instead of `flatMapConcat` or `flatMapPush`. * Using `map()`, `reduce()`, and `concat()` together. * Implementing a custom array concatenation function using bitwise operations (e.g., `push()` with a buffer). Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the original `flatMapConcat` and `flatMapPush` approaches.
Related benchmarks:
Flatmaps with native (large array)
flatMap vs reduce vs reduce (list push)
flatMap vs reduce.concat vs reduce.push
flatMap vs reduce vs reduce with push
flatMap vs reduce with spread vs reduce with push
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