在array.reduce中使用对象解构

const str = 'Jack:13,Phil:15,Lucy:12'

const arr = str.split(',')

let reducer = (acc, val) => {
  return { ...acc,
    ...{
      [val.split(':')[0]]: Number(val.split(':')[1])
    }
  }
}

let reducer2 = (acc, val) => {
  return Object.assign(acc, {
    [val.split(':')[0]]: Number(val.split(':')[1])
  })
}

let obj = {
  Jody: 29
}

let obj2 = {
  Julie: 28
}

arr.reduce(reducer, obj)
arr.reduce(reducer2, obj2)

console.log(obj)
/* output:
{
  "Jody": 29
}
*/
console.log(obj2)
/* output:
{
  "Julie": 28,
  "Jack": 13,
  "Phil": 15,
  "Lucy": 12
}
*/