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reduce vs. flatMap v3
(version: 0)
Comparing performance of:
reduce and push vs flatMap
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = Array(10_000).fill(0)
Tests:
reduce and push
arr.reduce((acc, x) => acc.push(x) && acc, [])
flatMap
arr.flatMap(x => [x])
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
reduce and push
flatMap
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark is designed to compare two approaches for performing aggregation on an array: `reduce` and `flatMap`. The goal is to determine which approach is faster. **Test Cases** There are two test cases: 1. **"reduce and push"`**: This test case uses the `reduce` method, which reduces an array by applying a function to each element. In this specific implementation, the accumulator (`acc`) is modified by pushing elements from the input array onto it. 2. **"flatMap"`**: This test case uses the `flatMap` method, which creates a new array with the results of applying a given function on every element in the original array. **Library and Purpose** In both test cases, an external library (`Array`) is used to create a large array with 10,000 elements, filled with zeros. This array will be processed by each benchmarked method. No specific JavaScript library or syntax features are being tested in this benchmark. **Benchmarked Methods** The two methods being compared are: 1. **`reduce`**: A built-in JavaScript array method that reduces an array by applying a function to each element. 2. **`flatMap`**: A built-in JavaScript array method introduced in ECMAScript 2017 (ES7), which creates a new array with the results of applying a given function on every element in the original array. **Pros and Cons** Here are some pros and cons for each approach: * `reduce`: + Pros: Can be used to aggregate elements, flexible in its behavior. + Cons: May not be as efficient as `flatMap`, can have issues with null or undefined values. * `flatMap`: + Pros: Efficient, easy to read and understand, can handle null or undefined values. + Cons: Introduced relatively recently (ES7), may not be supported in older browsers. **Other Alternatives** If you need to perform aggregation on an array but don't have access to `reduce` or `flatMap`, you could consider using: * A custom loop: Create a simple loop that iterates over the array, performing the desired operation on each element. * Another library method: Depending on your specific requirements, another library method (e.g., `forEach`) might be suitable. **Additional Notes** Keep in mind that this benchmark is focused specifically on comparing the performance of `reduce` and `flatMap`. If you need to perform more complex operations or handle edge cases, additional methods or approaches may be necessary.
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