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Comments (2)

gcanti avatar gcanti commented on June 16, 2024

toResource2 is (half of) a prism

import { array } from 'fp-ts/lib/Array'
import { Option, option, some } from 'fp-ts/lib/Option'
import { Prism } from 'monocle-ts'

export interface Resource {
  id: number
  type: Option<string>
}

const resources = [{ id: 5, type: some('pen') }, { id: 7, type: some('car') }]

export interface Resource2 {
  id: number
  type: string
}

const toResource2 = new Prism<Resource, Resource2>(
  s => s.type.map(type => ({ ...s, type })),
  a => ({ ...a, type: some(a.type) })
)

const resources2 = array.traverse(option)(resources, toResource2.getOption)

from monocle-ts.

leemhenson avatar leemhenson commented on June 16, 2024

Ah yes of course, I forgot you can just define your own Prisms. Thanks 👍

from monocle-ts.

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