fiboEvenSum.js

function fiboEvenSum(n) {
  let a = 1;
  let b = 2;
  let c = 0;
  let sum = 0;

  if (n >=2){
    sum += 2;
  }

  while(n > c){
    c = a + b;
    a = b;
    b = c;
    if (c % 2 === 0){
      sum += c;
    }
  }

  return sum;
}