Match.either

結果をEither (effect)型でラップ

code:ts

import { Match } from "effect"

type User = { readonly role: "admin" | "editor" | "viewer" }

// Create a matcher to extract user roles

const getRole = Match.type<User>().pipe(

Match.when({ role: "admin" }, () => "Has full access"),

Match.when({ role: "editor" }, () => "Can edit content"),

Match.either // Wrap the result in an Either

)

console.log(getRole({ role: "admin" }))

// Output: { _id: 'Either', _tag: 'Right', right: 'Has full access' }

console.log(getRole({ role: "viewer" }))

// Output: { _id: 'Either', _tag: 'Left', left: { role: 'viewer' } }