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Caso de uso do Maybe/Option para resolver o idioma do usuário.
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import * as Maybe from './main'; | |
// ..:: Contexto ::.. | |
enum LanguageEnum { | |
PORTUGUESE = 'pt-BR', | |
ENGLISH = 'en-US', | |
} | |
type User = { | |
id: string; | |
language?: LanguageEnum; | |
}; | |
const getCurrentUser = (): null | User => null; | |
type Organization = { | |
id: string; | |
language: LanguageEnum; | |
}; | |
// Função que pode falhar. | |
const getCurrentOrganization = (): Organization => ({ | |
id: '...', | |
language: LanguageEnum.PORTUGUESE, | |
}); | |
// ..:: Regras de negócio ::.. | |
// 1. Pegar o idioma do usuário. | |
// 2. Se não der, pegar o idioma da organização. | |
// 3. Se não der, pegar o idioma do computador similar aos idiomas suportados. | |
// 4. Se não der, usar o idioma inglês. | |
// ..:: Resolução ::.. | |
const getLanguageFromUser = () => | |
Maybe.fromNullish(getCurrentUser()) | |
.chain((user) => Maybe.fromNullish(user.language)); | |
const getLanguageFromOrganization = () => | |
Maybe.tryCatch(getCurrentOrganization) | |
.map((organization) => organization.language); | |
const resolveLanguage = (language: string): Maybe.Maybe<LanguageEnum> => { | |
if (language.startsWith('pt')) return Maybe.Some(LanguageEnum.PORTUGUESE); | |
if (language.startsWith('en')) return Maybe.Some(LanguageEnum.ENGLISH); | |
return Maybe.None; | |
}; | |
const getLanguageFromBrowser = () => | |
Maybe.Some(window.navigator.languages) | |
.chain(([ language ]) => Maybe.fromNullish(language)) | |
.chain(resolveLanguage); | |
const FALLBACK_LANGUAGE = LanguageEnum.ENGLISH; | |
const getLanguage = (): LanguageEnum => | |
getLanguageFromUser() | |
.alt(getLanguageFromOrganization) | |
.alt(getLanguageFromBrowser) | |
.getOrElse(() => FALLBACK_LANGUAGE); | |
export default getLanguage; |
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