JS中的reduce歸并和...擴展運算符，可以重構一個對象
2023-08-31 15:07:51
```javascript
arr = [{ a: 1, b: 2, subjects: [{ str: 'c', number: 3 }, { str: 'd', number: 4 }, { str: 'e', number: 5 }] },
{ a: 11, b: 12, subjects: [{ str: 'c', number: 23 }, { str: 'd', number: 34 }, { str: 'e', number: 65 }] }];
const result = arr.map(obj => {
const a = obj.a;
const b = obj.b;
//console.log(a);
//console.log(b);
const subjectObj = obj.subjects.reduce((acc, subject) => {
acc[subject.str] = subject.number;
//console.log(acc);
return acc;
}, {});
/*
...subjectObj
const c = acc.c;
const d = acc.d;
const e = acc.e;
*/
/* console.log(subjectObj);
console.log({ a,b, ...subjectObj});*/
return { a,b, ...subjectObj };
});
console.log(result);
```