partial.lenses | Partial lenses | Functional Programming library
kandi X-RAY | partial.lenses Summary
kandi X-RAY | partial.lenses Summary
Lenses are basically an abstraction for simultaneously specifying operations to update and query immutable data structures. Lenses are highly composable and can be efficient. This library provides a rich collection of partial isomorphisms, lenses, and traversals, collectively known as optics, for manipulating JSON and users can write new optics for manipulating non-JSON objects, such as Immutable.js collections. A partial lens can view optional data, insert new data, update existing data and remove existing data and can, for example, provide defaults and maintain required data structure parts. Try Lenses!.
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Top functions reviewed by kandi - BETA
- enable visual highlighting
- Creates a new function that matches the kind of a kind .
- Creates a new P .
- Find tips for links
- Ensure a pattern is an array
- Creates a function that matches an X .
- Create the menu contents
- Called when finished processing
- Modify an object .
- Update the visibility of the view
partial.lenses Key Features
partial.lenses Examples and Code Snippets
Lines of Code : 35License : Permissive (MIT)
Copyimport L from "partial.lenses"
import LB from "partial.lenses.builder"
const products = [
{
id: 1,
name: "SuperCool 9001",
dimensions: { width: 1.5, height: 2.5, weight: 400 }
},
{
id: 2,
name: "AlmostAsCool 9000",
dim 
License : No LicenseCopyimport * as F from 'freer'
import * as L from 'partial.lenses'
import * as R from 'ramda'
Community Discussions
Trending Discussions on partial.lenses
QUESTION
I'm trying to figure out how to create a lens that'll give me an array of the key values from within an array. Here's a simple example:
...ANSWER
Answered 2019-Feb-22 at 01:33Use L.collect instead of L.get, L.get returns the first found entity, while L.collect returns all matching entities, similar to [].filter vs [].find.
QUESTION
I understand that partial.lenses isn't necessarily the best solution to the following problem and that's besides the point in this question. I was trying to list files from a directory using L.collect from the partial.lenses library. Goal is just to get a flattened array of file names.
Problem: instead of using fs.readdirSync I would like to make use of asynchronous, Promise returning versions of the Node's fs API, in my optics.
The following would be the promisified version of the readdir:
...ANSWER
Answered 2018-Nov-16 at 07:58This is an interesting question in the sense that Partial Lenses can work on asynchronous problems like this, but the library currently only provides a little bit of direct support for asynchronous operations out-of-the-box. In the future the library could certainly be extended to provide more support for performing asynchronous operations.
Traversals in Partial Lenses build applicative operations. By using different applicatives different kinds of operations, like collecting elements, computing a minimum of elements, or computing a new version of the data structure, can be performed.
Many operations, like collecting elements or computing minimums, have an underlying monoid. Any monoid, like array concatenation
QUESTION
I have an array of objects like this:
...ANSWER
Answered 2018-Nov-16 at 01:38You can use Array.reduce
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