monocle-ts | Functional optics : a porting of Scala monocle | Functional Programming library

by gcanti TypeScript Version: 2.3.13 License: MIT

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kandi X-RAY | monocle-ts Summary

monocle-ts is a TypeScript library typically used in Programming Style, Functional Programming applications. monocle-ts has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Functional optics: a (partial) porting of Scala monocle

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Quality

Security

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Support

monocle-ts has a medium active ecosystem.

It has 968 star(s) with 51 fork(s). There are 23 watchers for this library.

It had no major release in the last 12 months.

There are 34 open issues and 58 have been closed. On average issues are closed in 56 days. There are 7 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of monocle-ts is 2.3.13

Quality

monocle-ts has 0 bugs and 0 code smells.

Security

monocle-ts has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

monocle-ts code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

monocle-ts is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

monocle-ts releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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monocle-ts Key Features

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monocle-ts Examples and Code Snippets

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Community Discussions

Trending Discussions on monocle-ts

Type predictions work only within pipe function

Functional Programming/Optic concept that takes a partial object and returns a "filled in" object using lenses and traversals?

QUESTION

Type predictions work only within pipe function

Asked 2020-Oct-18 at 17:26

I'm using monocle-ts (https://github.com/gcanti/monocle-ts) library in my project. I have the following code

...

ANSWER

Answered 2020-Oct-18 at 17:26

The alternative notation you tried is a two-step process that first creates a lambda function using prop('a') and then immediately invoking it with ...(stateLens). The prop() function only receives a key name 'a', but cannot determine the object it belongs to as it only has the string parameter 'a' to work with. So, in the type definitions of prop the type A will be resolved to never because it's not assigned and cannot be inferred.

I didn't test this, but you probably can do the same by manually passing along the type like

Source https://stackoverflow.com/questions/64416082

QUESTION

Functional Programming/Optic concept that takes a partial object and returns a "filled in" object using lenses and traversals?

Asked 2020-Sep-08 at 23:31

(Edit I'm using monocle-ts, but if it's not possible with monocle-ts (since the author even says it's just a partial port of the original Monocle for Scala) but if there is something in another optics package for any language, I'm open to porting those ideas to TypeScript.)

Suppose I have a helper type Partial such that it represents a record that has some or all, but no non-members, of type A. (So if A = { foo: number, bar: string } then Partial = { foo?: number, bar?: string }) (Edit This is Typescript's built-in Partial utility type.)

I begin with

...

ANSWER

Answered 2020-Sep-08 at 23:31

I think, what you might want is a Polymorphic Traversal or PTraversal.

A Traversal says, "If I have a function A => A, I can use modify to obtain a function S => S that uses the original function to modify all of the As that appear in S".

By comparison, a PTraversal says, "if I have a function A => B, I can use modify to obtain a function S => T", this converts all of the As in S to B, producing a T.

Mnemonically, the type parameters of PTraversal are: