Initial Zipper implementation

[2lambda123]

Description

This pull request introduces several changes to the codebase. Here is a bullet point summary of the changes made:

• Added a new class Focus in the package com.jnape.palatable.lambda.functions.builtin.fn1. This class implements the Fn1 interface and takes a Zipper as input. It returns a Maybe of the focused element in the Zipper.

• Added a new class Next in the package com.jnape.palatable.lambda.functions.builtin.fn1. This class implements the Fn1 interface and takes a Zipper as input. It returns the next element in the Zipper. If there is no next element, it returns the same Zipper.

• Added a new class Reset in the package com.jnape.palatable.lambda.functions.builtin.fn1. This class implements the Fn1 interface and takes a Cont as input. It executes the continuation with the identity function.

• Added a new class Shift in the package com.jnape.palatable.lambda.functions.builtin.fn1. This class implements the Fn1 interface and takes a function as input. It wraps the supplied function into a Cont and returns it.

• Added a new class ZipUp in the package com.jnape.palatable.lambda.functions.builtin.fn1. This class implements the Fn1 interface and takes a Zipper as input. It performs a trampoline operation on the Zipper to complete any pending operations and returns the final Traversable result.

• Added a new class Cont in the package com.jnape.palatable.lambda.monad.builtin. This class implements the Monad interface and wraps a continuation function. It provides various operations for working with continuations, such as runCont, fmap, zip, discardL, discardR, pure, and flatMap.

• Added a new class Zipper in the package com.jnape.palatable.lambda.zipper. This class represents a data structure that allows traversal of a Traversable data structure with a focus on a particular element. It provides methods for creating a new Zipper, moving to the next or previous element, setting the focus on a new element, and extracting the result.

These changes aim to improve the functionality and flexibility of the codebase by introducing new classes and operations that can be used in various scenarios.

Summary by CodeRabbit

• New Features
  • Introduced the Focus class for focusing on specific elements within a Zipper structure.
  • Added the Next class for navigating to the next element in a Zipper.
  • Implemented the Reset class for resetting computations in a continuation monad.
  • Created the Shift class for shifting the continuation of a computation.
  • Launched the ZipUp class for converting a Zipper into a Traversable structure.
  • Introduced the Cont monad for handling continuations with support for various operations.
  • Added the Zipper class for creating and manipulating zipper structures for traversable data types.

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Thanks @2lambda123 for opening this PR!

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[quine-bot[bot]]

👋 Figuring out if a PR is useful is hard, hopefully this will help.

• @2lambda123 has been on GitHub since 2019 and in that time has had 1834 public PRs merged
• They haven't contributed to this repo before
• Here's a good example of their work: maybe-finance-maybe
• From looking at their profile, they seem to be good with Python and HTML.

Their most recently public accepted PR is: https://github.com/2lambda123/kwenta/pull/29

[coderabbitai[bot]]

Walkthrough

This update enriches functional programming capabilities by introducing new classes for manipulating zipper data structures, focusing on elements within traversable data structures, and enhancing continuation monads. These changes expand the toolkit for precise data manipulation, enabling developers to navigate and modify collections and computational contexts with increased flexibility and granularity.

Changes

File Path	Change Summary
.../fn1/Focus.java .../fn1/Next.java .../fn1/ZipUp.java	Introduced classes for focusing on elements, navigating to the next element, and zipping up a Zipper into a Traversable structure within zipper data structures.
.../fn1/Reset.java .../fn1/Shift.java	Added classes for resetting and shifting computations in continuation monads.
.../monad/builtin/Cont.java	Introduced a Cont class implementing the Monad interface for handling continuations with various operations.
.../zipper/Zipper.java	Introduced a Zipper class for creating and manipulating zipper structures for traversable data types, including a demonstration.

🐰✨
In a world of data so vast and wide,
A rabbit hops with a functional guide.
Zippers to navigate, continuations to bind,
Focusing on elements, leaving none behind.
With each leap and bound under the moonlit sky,
Our code grows stronger, our spirits high.
🌟📚🐾

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[git-greetings[bot]]

First PR by @2lambda123

PR Details of @2lambda123 in palatable-lambda :	OPEN	CLOSED	TOTAL
1	0	1

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Description has been updated!

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Description has been updated!

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