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flatMap vs flat+map 2
(version: 0)
Comparing performance of:
flatmap vs map+flat
Created:
one year ago
by:
Guest
Go to the latest result
Script Preparation code:
var arr = Array(500).fill('test')
Tests:
flatmap
arr.flatMap((x) => [x, x])
map+flat
arr.map((x) => [x, x]).flat()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
flatmap
map+flat
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser/OS:
Chrome 134 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=594575" width="100%" height="500px"></iframe>
map+flat
76K/s
flatmap
73K/s
View exact numbers
Test name
Executions per second
✓
map+flat
75,807 Ops/sec
flatmap
73,026 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Definition and Script Preparation Code** The benchmark definition is a JSON object that specifies the test case: `flatMap vs flat+map 2`. The script preparation code is a simple JavaScript snippet that creates an array with 500 elements, all filled with the string 'test'. This array will be used as input for both test cases. **Individual Test Cases** There are two individual test cases: 1. **flatMap**: The first test case uses the `flatMap` method on the `arr` array. `flatMap` is a method that creates a new array by performing an operation on each element of the original array and returning an array of the results. In this case, it's using a callback function to create a new array with the elements of the original array duplicated. 2. **map+flat**: The second test case uses two separate methods: `map` and then `flat`. `map` applies a given function to each element of an array and returns a new array with the results, while `flat` flattens an array that contains nested arrays. **Options Compared** In this benchmark, we have two options: * **flatMap**: Using `flatMap` to create a new array by performing an operation on each element. * **map+flat**: Using `map` and then `flat` to create a new array by first mapping the original array and then flattening the result. **Pros and Cons of Each Approach** Here are some pros and cons of each approach: * **flatMap**: + Pros: Can be faster because it avoids the overhead of creating an intermediate array. + Cons: May not work as expected if the callback function returns an array, because `flatMap` will recursively call itself on that array. In this benchmark, it works fine, but it's worth noting. * **map+flat**: + Pros: More flexible because you can use different functions for mapping and flattening. + Cons: Can be slower because it creates two intermediate arrays (one for mapping and one for flattening). **Library Used** There is no explicit library mentioned in the benchmark definition or individual test cases. However, both `flatMap` and `flat` methods are part of the ECMAScript standard. **Special JS Feature or Syntax** Neither of these test cases uses any special JavaScript features or syntax that's not well-supported across most modern browsers. **Other Alternatives** If you're interested in exploring other alternatives, here are a few: * Using `reduce` instead of `flatMap` could be another option. `reduce` applies a function to each element of an array and returns a single value. * Using libraries like Lodash or Ramda might provide additional functionality for working with arrays, but these test cases are designed to demonstrate the built-in `flatMap` and `flat` methods. In summary, this benchmark compares two approaches to flattening an array: using `flatMap` directly versus using `map` followed by `flat`. The results suggest that `flatMap` can be faster in this specific case.
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