如何将数组转换为对象并在Javascript中赋值？

Question

我有用于数据映射的数组值和对象。 reduce 方法不适用于对象映射，这是示例数据。

数组值为

let array = [ "payload", "offer", "application_id" ]

对象值为

let data = {
                organization_id: 4002400004,
                organization_name: 'Velocity Global Integration Sandbox',
                action: 'offer_updated',
                payload: {
                    offer: {
                        id: 4524843004,
                        application_id: 31948577004,
                        user_id: 4123647004,
                        version: 1,
                        sent_on: null,
                        resolved_at: '2022-05-19T06:21:25.084Z',
                        start_date: '2022-05-17',
                        notes: null,
                        job_id: 4298940004,
                        offer_status: 'Accepted'
                    },
                    "resume": {
                        name: "manikandan"
                    }
                }
            }

需要用响应形成新对象

let payload = {
    offer: {
        application_id: 343645656
    }
}

Answer 1

这是一个使用循环的相对简单的解决方案。

这个想法是遍历数组，并始终保持对当前对象的引用。 由于对象是引用，因此修改o将修改嵌套在ret中的对象。

function pair(array, data) {
  const ret = {};
  let o = ret, d = data;
  for (let i = 0; i < array.length - 1; i++) {
    const k = array[i];
    o[k] = {};
    o = o[k];
    d = d[k];
  }
  const k = array[array.length - 1];
  o[k] = d[k];
  return ret;
}

Answer 2

虽然我通常避免推荐使用eval ，但这种特定情况似乎是eval的有效用例。 您可以简单地将数组的第一项提取为变量名，然后将后续的数组项提取为级别：

 let array = [ "payload", "offer", "application_id" ] let data = { organization_id: 4002400004, organization_name: 'Velocity Global Integration Sandbox', action: 'offer_updated', payload: { offer: { id: 4524843004, application_id: 31948577004, user_id: 4123647004, version: 1, sent_on: null, resolved_at: '2022-05-19T06:21:25.084Z', start_date: '2022-05-17', notes: null, job_id: 4298940004, offer_status: 'Accepted' }, "resume": { name: "manikandan" } } } /*let payload = { offer: { application_id: 343645656 } }*/ function getNestedObject(data, array, index) { return {[array[index]] : ((index < array.length - 1) ? getNestedObject(data[array[index]], array, index + 1) : data[array[index]])}; } eval(`var ${array[0]} = getNestedObject(data[array[0]], array, 1)`); console.log(payload);