This is an aggregation function

wtf.js

let a = [
  {
    id: '1000000'
  },
  {
    id: '1100000'
  },
  {
    id: '1200000',
  },
  {
    id: '11100000'
  },
  {
    id: '11200000'
  },
  {
    id: '11300000'
  },
  {
    id: '12100000'
  },
  {
    id: '121100000'
  },
]
let currentLevel = 1;
let result_obj = {}

function wtf(arrayOfObj) {
  let arr = arrayOfObj.filter(obj => {
    let {id} = obj;
    let firstZeroIndex = id.indexOf('0');
    let sub = id.substring(0, firstZeroIndex);
    return sub.length === currentLevel
  });

  if (arr.length <= 0) return result_obj;

  for (let i = 0; i < arr.length; i++) {
    let obj = arr[i];
    let {id} = obj
    let firstZeroIndex = id.indexOf('0');
    let sub = id.substring(0, firstZeroIndex);
    let split_sub = sub.split('');

    if (split_sub.length === 1) {
      result_obj = {
        ...obj,
        children: {}
      };
      break
    }

    split_sub.shift();
    let part_obj = {
      ...obj,
      children: {}
    };

    let attr_string = '';

    for (let key of split_sub) {
      attr_string = `${attr_string}.children[${key}]`
    }

    let exec_string = `result_obj${attr_string} = part_obj`
    eval(exec_string);
  }

  currentLevel++;
  return wtf(arrayOfObj)
}

let b = wtf(a)
console.log({b})

let Entity = require('./Entity')

let a = [
{
name: '112 BN',
sidc: '10031000161211000000',
position: {
latitude: 9.8717,
longitude: 8.1837
},
id: '100000000000000'
},
{
name: 'A COY',
sidc: '10031000151211000000',
position: {
latitude: 9.0421,
longitude: 7.6354
},
id: '110000000000000'
},
{
name: 'B COY',
sidc: '10031000151211000000',
position: {
latitude: 9.7846,
longitude: 6.4256
},
id: '120000000000000'
},
{
name: 'C COY',
sidc: '10031000151211000000',
position: {
latitude: 10.0421,
longitude: 7.9292
},
id: '130000000000000'
},
{
name: '1 PL',
sidc: '10031000141211000000',
position: {
latitude: 9.2387,
longitude: 6.0192
},
id: '111000000000000'
},
{
name: '2 PL',
sidc: '10031000141211000000',
position: {
latitude: 9.3984,
longitude: 6.8926
},
id: '112000000000000'
},
{
name: '3 PL',
sidc: '10031000141211000000',
position: {
latitude: 10.0231,
longitude: 7.0192
},
id: '113000000000000'
},
{
name: '4 PL',
sidc: '10031000141211000000',
position: {
latitude: 9.4562,
longitude: 7.0349
},
id: '121000000000000'
},
{
name: '6 PL',
sidc: '10031000141211000000',
position: {
latitude: 10.4223,
longitude: 5.8992
},
id: '122000000000000'
},
{
name: '7 PL',
sidc: '10031000141211000000',
position: {
latitude: 9.0891,
longitude: 5.3495
},
id: '131000000000000'
},
{
name: '8 PL',
sidc: '10031000141211000000',
position: {
latitude: 8.7421,
longitude: 7.0192
},
id: '132000000000000'
},
{
name: '9 PL',
sidc: '10031000141211000000',
position: {
latitude: 9.8764,
longitude: 7.6573
},
id: '133000000000000'
}
]

let currentLevel = 1;
let result_obj = {}
function wtf(arrayOfObj) {
let arr = arrayOfObj.filter(obj => {
let {id} = obj;
let firstZeroIndex = id.indexOf('0');
let sub = id.substring(0, firstZeroIndex);
return sub.length === currentLevel
});
if(arr.length <= 0) return result_obj;
for(let i = 0; i < arr.length; i++){
let obj = arr[i];
let {id, name, sidc, position} = obj
let firstZeroIndex = id.indexOf('0');
let sub = id.substring(0, firstZeroIndex);
let split_sub = sub.split('');
if(split_sub.length === 1){
result_obj = new Entity(name, sidc, position, id)
break
}
split_sub.shift();
let part_obj = new Entity(name, sidc, position, id)
let attr_string = '';
for(key of split_sub){
attr_string = ${attr_string}.children[${key}]
}
let exec_string = result_obj${attr_string} = part_obj
eval(exec_string);
}
currentLevel++;
return wtf(arrayOfObj)

}
let b = wtf(a)

console.log({b})