使用 reduce() 和 Typescript 解析嵌套对象
Parsing nested object using reduce() and Typescript
我实际上正在尝试将一些 Javascript 代码转换为 Typescript,但我在以下函数上遇到了问题。它的目的是解析一些内容(从 JSON.parse() 构建的嵌套对象),当像这样调用时,例如:t('common.error')
.
const i18nContent = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language',
},
languages_available: 'This article is available in other languages'
}
const t = (key) => {
const kArray = key.split('.')
// Parsing possibly nested object
const keyValue = kArray.reduce((o, k) => ((o && o[k] !== 'undefined') ? o[k] : undefined), i18nContent)
return keyValue || key
}
我试过这种方法,它似乎有效,但对我来说似乎很丑...:/
type I18nContent = Record<string, unknown> // Content value could be a string, or a nested object
type I18n = Record<string, I18nContent> // API always returns an object with namespace as key, and object (possibly nested) as value
const i18nContent: I18n = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language'
},
languages_available: 'This article is available in other languages'
}
}
const t = (key: string): string => {
const kArray = key.split('.')
const keyValue = kArray.reduce((o: unknown, k: string) => {
if (o && typeof o === 'object' && Object.keys(o).length && o[k as keyof typeof o] !== 'undefined') {
return o[k as keyof typeof o]
} else {
return undefined
}
}, i18nContent)
return typeof keyValue === 'string' ? keyValue : key
}
我是 Typescript 的新手,所以我很乐意得到一些反馈,也许还有关于这个重构的建议?
提前致谢!
因为 reduce
函数 return 类型作为初始值的类型,所以我在您的代码中做了一些更改以支持 i18n 嵌套多级对象。
interface ITranslationContent {
[key: string]: string | ITranslationContent;
}
const i18nContent: ITranslationContent = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language',
http_code: {
unauthorized: '401'
}
},
languages_available: 'This article is available in other languages'
}
}
const t = (key: string): string | ITranslationContent => {
const kArray = key.split('.')
let res: string | ITranslationContent = i18nContent;
kArray.forEach((k: string) => {
res = typeof res === 'string' ? res : res[k];
})
return res || key;
}
我实际上正在尝试将一些 Javascript 代码转换为 Typescript,但我在以下函数上遇到了问题。它的目的是解析一些内容(从 JSON.parse() 构建的嵌套对象),当像这样调用时,例如:t('common.error')
.
const i18nContent = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language',
},
languages_available: 'This article is available in other languages'
}
const t = (key) => {
const kArray = key.split('.')
// Parsing possibly nested object
const keyValue = kArray.reduce((o, k) => ((o && o[k] !== 'undefined') ? o[k] : undefined), i18nContent)
return keyValue || key
}
我试过这种方法,它似乎有效,但对我来说似乎很丑...:/
type I18nContent = Record<string, unknown> // Content value could be a string, or a nested object
type I18n = Record<string, I18nContent> // API always returns an object with namespace as key, and object (possibly nested) as value
const i18nContent: I18n = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language'
},
languages_available: 'This article is available in other languages'
}
}
const t = (key: string): string => {
const kArray = key.split('.')
const keyValue = kArray.reduce((o: unknown, k: string) => {
if (o && typeof o === 'object' && Object.keys(o).length && o[k as keyof typeof o] !== 'undefined') {
return o[k as keyof typeof o]
} else {
return undefined
}
}, i18nContent)
return typeof keyValue === 'string' ? keyValue : key
}
我是 Typescript 的新手,所以我很乐意得到一些反馈,也许还有关于这个重构的建议?
提前致谢!
因为 reduce
函数 return 类型作为初始值的类型,所以我在您的代码中做了一些更改以支持 i18n 嵌套多级对象。
interface ITranslationContent {
[key: string]: string | ITranslationContent;
}
const i18nContent: ITranslationContent = {
common: {
error: {
missing_translation: 'Missing translation',
missing_posts: 'Some articles are not available in this language',
http_code: {
unauthorized: '401'
}
},
languages_available: 'This article is available in other languages'
}
}
const t = (key: string): string | ITranslationContent => {
const kArray = key.split('.')
let res: string | ITranslationContent = i18nContent;
kArray.forEach((k: string) => {
res = typeof res === 'string' ? res : res[k];
})
return res || key;
}