[英]How to convert an array of objects into a single object using reduce?
我有以下 object 數組。
[
{ claimNumber1: 'R12345', checkNumber1: '' },
{ claimNumber2: 'T1234', checkNumber2: 'abcd' },
{ claimNumber3: 'Z4567', checkNumber3: 'qwer' }
]
使用reduce
,我想將其轉換為以下。
{
claimNumber1:'R12345',
checkNumber1:'',
claimNumber2:'T1234',
checkNumber2:'',
claimNumber3:'Z4567',
checkNumber3:'',
}
我在下面嘗試過,但沒有得到我所期望的。
.reduce((obj, item) =>{
return {...obj,item}
} ,{});
您應該傳播item
object,因為item
是 object
const arr = [ { claimNumber1: "R12345", checkNumber1: "" }, { claimNumber2: "T1234", checkNumber2: "abcd" }, { claimNumber3: "Z4567", checkNumber3: "qwer" }, ]; const result = arr.reduce((obj, item, i) => { return {...obj, ...item, [`checkNumber${i + 1}`]: "" }; }, {}); console.log(result);
差不多好了。 您也只需要spread
該item
。
.reduce((obj, item) => {
return {
...obj,
...item,
};
}, {});
我認為你應該在減速器中傳播每一個項目。 這是我的代碼。
const res = arr.reduce((prev, item) => {
return { ...prev, ...item };
}, {});
結果是
{
claimNumber1: 'R12345',
checkNumber1: '',
claimNumber2: 'T1234',
checkNumber2: 'abcd',
claimNumber3: 'Z4567',
checkNumber3: 'qwer'
}
我不確定在這種情況下使用reduce
的好處。 一個簡單的循環將是自記錄的,並且更易於閱讀。
const data = [ { claimNumber1: 'R12345', checkNumber1: '' }, { claimNumber2: 'T1234', checkNumber2: 'abcd' }, { claimNumber3: 'Z4567', checkNumber3: 'qwer' } ]; const out = {}; // For every object in the array for (const obj of data) { // Get an array of its keys and iterate over them for (const key of Object.keys(obj)) { // If it's a claim add that value to the output // object property, otherwise set that property value // to an empty string. if (key.startsWith('claim')) { out[key] = obj[key]; } else { out[key] = ''; } } } console.log(out);
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