SOURCE

const data = [
    {
      "id": 1,
      "geom_xy": "POINT (0 0)",
      "geom_z": "0"
    },
    {
      "id": 2,
      "geom_xy": "LINESTRING (1 1, 2 2, 3 3)",
      "geom_z": "1,2,3"
    },
    {
      "id": 3,
      "geom_xy": "POLYGON ((4 4, 5 5, 6 6, 7 7, 4 4))",
      "geom_z": "4,5,6,7,4"
    }
  ]
  // 转换成
  const result = [
    {
      id: 1,
      geom: {
        type: "Point",
        coordinates: [
          [0, 0, 0]
        ]
      }
    }
  ]

 function transArr(data) {
    return data.reduce((acc, curr) => {
      let id = curr.id
      let geom0 = curr.geom_xy.split('(')
      let geom1 = geom0[geom0.length-1].split(')')[0].split(',')
      let geomz = curr.geom_z.split(',')
      let geom3D = geom1.reduce((acc1, curr1, index1) => {
        return acc1.concat( [curr1.trim().split(' ').concat(geomz[index1]) ] )
      }, [])
      // console.log(geom3D)
      let type = curr.geom_xy.split('(')[0].trim()
      let obj = {
        id: id,
        geom: {
          type: type,
          coordinates: geom3D
        }
      }
      acc.push(obj)
      return acc
    }, [])
  }
  
  console.log(transArr(data))

  const data1 = [
    {
        key: 'name',
        value: '123'
    },
    {
        key: 'age',
        value: '456'
    },
    {
        key: 'from',
        value: 'beijing'
    }
]
function trans(arr) {
//   let obj = {}
  // let obj = new Map()
  //   let o = arr.reduce((acc, curr) => {
  //     return acc.set(curr.key, curr.value)
  //   }, obj)
    // for(let k of arr) {
    //   obj[k.key] = k.value
    // }
    // return obj
    return arr.reduce(function(acc, cur) {
      // let k = cur.key
      // console.log(k, cur.value)
      acc[cur.key] = cur.value
      return acc
    },{})
}
console.log(trans(data1))