Given a string containing alphanumeric characters, calculate sum of all numbers present in the string.

sumFromString.js

function sumFromString(str) {
  let sum = 0;
  let acc = '0';
  for (var i = 0; i < str.length; i +=1) {
    if (parseInt(str[i])) {
      acc += str[i]
      if (i === (str.length - 1)) {
        sum += parseInt(acc);
      }
    } else {
      sum += parseInt(acc);
      acc = '0';
    }
  }
  return sum;
}

// sumFromString('a4gnh7j');
// => 11

// sumFromString('rgb5ny774bsdfg6');
// => 785