[英]How to flatten nested objects in Typescript?
我正在嘗試將以下 object 'raw' 展平為 object 'flat'
raw = [ {
"id":"123",
"Date":"12/12/2020",
"Type":{
"id":"456",
"desc":"test1"
} }, {
"id":"124",
"Date":"12/12/2020",
"Type":{
"id":"456",
"desc":"test2"
} } ]
flat =[ {
"id":"123",
"Date":"12/12/2020",
"desc":"test1"
},
{
"id":"124",
"Date":"12/12/2020",
"desc":"test2"
}]
我嘗試了以下操作:
let flatData:any = []
const flattenObject = (obj:any) => {
const flattened:any = {}
Object.keys(obj).forEach((key) => {
if (typeof obj[key] === 'object' && obj[key] !== null) {
Object.assign(flattened, flattenObject(obj[key]))
} else {
flattened[key] = obj[key]
}
})
flatData.push(flattened)
console.log(flattened)
return flattened
}
結果我從上面的代碼片段中得到。
..................................................... .........................................................
您可以在 TypeScript 中使用object 解構。
const raw = [{ "id": "123", "Date": "12/12/2020", "Type": { "id": "456", "desc": "test1" } }, { "id": "124", "Date": "12/12/2020", "Type": { "id": "456", "desc": "test2" } }]; const mapped = raw.map(({ id, Date, Type: { desc } }) => ({ id, Date, desc })); console.log(mapped);
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您用於展平 object 的 function 是正確的,但是Type
屬性中的嵌套id
屬性與頂級id
屬性具有相同的屬性名稱。 當您展平 object 時,該頂級id
值將被嵌套的id
值覆蓋。
解決方案:
id
屬性重命名為其他名稱。flattenObject
function 中,您可以使用父屬性名稱作為嵌套屬性的前綴。 IEconst flattenObject = (obj:any, prefix = '') => {
const flattened:any = {}
Object.keys(obj).forEach((key) => {
if (typeof obj[key] === 'object' && obj[key] !== null) {
Object.assign(flattened, flattenObject(obj[key], prefix))
} else {
flattened[prefix + key] = obj[key]
}
})
flatData.push(flattened)
return flattened
如果您只有一個深度級別並且想要展平對象,無論屬性名稱是什么,這是一個有效的解決方案:
const raw = [ { id: "123", Date: "12/12/2020", Type: { id: "456", desc: "test1", }, }, { id: "124", Date: "12/12/2020", Type: { id: "456", desc: "test2", }, }, ]; const flatten = (obj) => Object.assign( {}, Object.fromEntries( Object.values(obj).filter((x) => typeof x === "object").map((x) => Object.entries(x)).flat(1) ), Object.fromEntries( Object.entries(obj).filter(([, x]) => typeof x;== "object") ) ). const compute = (data) => data;map(flatten). console;log(compute(raw));
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