https://github.com/atticuskuhn/typescript-lens

lens library in typescript
https://github.com/atticuskuhn/typescript-lens

fp functional-programming haskell lens

Last synced: about 2 months ago
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lens library in typescript

• Host: GitHub
• URL: https://github.com/atticuskuhn/typescript-lens
• Owner: AtticusKuhn
• Created: 2021-11-24T01:20:26.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2021-12-02T05:00:10.000Z (over 4 years ago)
• Last Synced: 2025-04-12T05:58:29.198Z (about 1 year ago)
• Topics: fp, functional-programming, haskell, lens
• Language: TypeScript
• Homepage:
• Size: 4.88 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Lens

This is a typescript library for lenses, an immutable way to access and mutate fields of datastructures. It is based on

haskell lenses [https://hackage.haskell.org/package/lens](https://hackage.haskell.org/package/lens)

# Example

Here is an example for accessing and modyfying a datastructure

```ts

type foo = {

    bar: [number, number],

    baz: string,

}

const myFoo: foo = {

    baz: "hi",

    bar: [1, 2]

}

// lensMaker function automatically generates lenses

const { bar, baz } = lensMaker()

console.log("bar is", view(bar)(myFoo))

// createLens automatically creates lenses from strings

const fooLensCreator = createLens()

const lens2 = fooLensCreator("bar.1")

console.log("the 2nd element of bar is is", view(lens2)(myFoo))

```