gistfile1.txt

const fs = require('fs')
const input = fs.readFileSync('./input8.txt');

let mapOfValues = {}
function readChild(offset, input) {
  let metaSum = 0;
  let current = offset;
  const numchildren = input[current];
  console.log('NumChildren', numchildren);
  current++;
  const nummeta = input[current];
  console.log('NumMeta', nummeta);
  current++;
  let currentChildren = [];
  for (let i = 0; i < numchildren; i++) {
    let { value, current: next } = readChild(current, input)
    current = next;
    currentChildren.push(value);
  }
  for (let j = 0; j < nummeta; j++) {
    if (numchildren === 0) {
      metaSum += input[current];
    } else {
      console.log(currentChildren, input[current])
      metaSum += currentChildren[input[current] - 1] || 0;
    }
    current++;
  }
  console.log('ChildVal', metaSum)
  return { value: metaSum, current };
}

function solve(input) {
  const { value, current } = readChild(0, input);
  console.log(value)

}
// solve('2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2'.toString().split(/ /gm).filter(s => s.trim() !== '').map(e => Number(e)))
solve(input.toString().split(/ /gm).filter(s => s.trim() !== '').map(e => Number(e)))