Pairing items in a list using the concept of functional programming

Question

Pairing items in a list using the concept of functional programming

Looking to arrange an array by grouping items together? For example:

[1, 1, 0, 1, 0, 1, 0] => [1, 1, 0, 1, 1, 0, 0]

OR

[1, 1, 0, 1, 0, 1, 0] => [[1, 1], [0], [1, 1], [0, 0]]

In this scenario, the goal is to group 1s with a maximum group size of 2 items. The objective is to pair values without grouping all items together.

Wondering about the best approach for writing such a function? Consider using Reduce or Sort. A clean solution utilizing functional programming techniques is preferred, especially if it allows for better abstractions. Although JavaScript is primarily used, solutions in any language are welcome as long as the logic is clear.

Background information: Working with a list of photos that need to be re-ordered so that square photos (represented by 1 in the example) appear adjacent to each other.

javascript functional-programming

Answer 1

Answer №1

What is the most effective approach to write my function?

Perhaps in a declarative yet efficient manner - aiming for an O(n) solution.

Utilize Reduce?

Essentially, every array traversal can be considered a form of reduce. While it can be used, it may not significantly enhance code readability in JavaScript.

Should we consider Sort?

No, sorting the list is not part of our current requirements.

I am seeking a concise solution using functional programming principles, preferably broken down into multiple steps to improve abstraction. Although I am working with JavaScript, I am open to solutions in any language as long as the logic remains clear.

In Haskell, the solution may look something like this:

import Control.Arrow
import Data.Either

groupRightPairs = groupNRights 2

// Rest of Haskell function goes here...

However, since JavaScript does not feature cons-lists, translating this directly may not yield optimal results. A more suitable JavaScript adaptation could look like the following:

// JavaScript function implementation goes here...

Answer 2

What is the most effective approach to write my function?

Perhaps in a declarative yet efficient manner - aiming for an O(n) solution.

Utilize Reduce?

Essentially, every array traversal can be considered a form of reduce. While it can be used, it may not significantly enhance code readability in JavaScript.

Should we consider Sort?

No, sorting the list is not part of our current requirements.

I am seeking a concise solution using functional programming principles, preferably broken down into multiple steps to improve abstraction. Although I am working with JavaScript, I am open to solutions in any language as long as the logic remains clear.

In Haskell, the solution may look something like this:

import Control.Arrow
import Data.Either

groupRightPairs = groupNRights 2

// Rest of Haskell function goes here...

However, since JavaScript does not feature cons-lists, translating this directly may not yield optimal results. A more suitable JavaScript adaptation could look like the following:

// JavaScript function implementation goes here...

Pairing items in a list using the concept of functional programming

Answer №1

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