我目前有以下数据结构:
const bar = [
{id:1, version:0, name:"test name A"},
{id:2, version:0, name:"test name B"},
{id:3, version:0, name:"test name C"}
];
我需要把它变成这个:
const foo = {
1:{id:1, version:0, name:"test name A"},
2:{id:2, version:0, name:"test name B"},
3:{id:3, version:0, name:"test name C"}
};
我实际拥有的代码是:
for(let i=0;len = bar.length; i< len;i++){
foo[bar[i].id]= bar[i];
}
我已经尝试过了
bar.map((element,index)=>{
const temporal = {[index]:element};
foo = {...foo, temporal};
});
但是我迷路了,有什么建议吗?
答案 0 :(得分:3)
您可以将reduce()
与Object.assign()
const bar = [
{id:1, version:0, name:"test name A"},
{id:2, version:0, name:"test name B"},
{id:3, version:0, name:"test name C"}
];
var result = bar.reduce((r, e) => Object.assign(r, {[e.id]: e}), {});
console.log(result)
&#13;
答案 1 :(得分:2)
您可以将Object.assign
与Array#map
和spread syntax ...
const
bar = [{ id: 1, version: 0, name: "test name A" }, { id: 2, version: 0, name: "test name B" }, { id: 3, version: 0, name: "test name C" }],
object = Object.assign(...bar.map(o => ({ [o.id]: o })));
console.log(object);
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答案 2 :(得分:1)
application:continueUserActivity:restorationHandler:
返回一个数组,如果你想返回一个对象,你可以使用Array.map
代替
Array.reduce
如果您只需要重新格式化数据以将其发送到API,则无需使用const bar = [
{id:1, version:0, name:"test name A"},
{id:2, version:0, name:"test name B"},
{id:3, version:0, name:"test name C"}
];
var foo = bar.reduce( (a,b,i) => (a[i+1] = b, a), {});
console.log(foo);
答案 3 :(得分:1)
您可以使用reduce
,也就是折叠或注入:
const bar = [
{id:1, version:0, name:"test name A"},
{id:2, version:0, name:"test name B"},
{id:3, version:0, name:"test name C"}
];
bar.reduce((obj, e, i) => { obj[e.id] = e; return obj}, {});
答案 4 :(得分:1)
另一种方法可能是使用迭代数组的forEach
,但不会像map
那样返回数组:
let foo = {};
bar.forEach((el, idx) => foo[idx+1] = el)