Even Fibonacci numbers code example

Example 1: fibonacci numbers

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...

Example 2: sum all odd fibonacci numbers

function sumFibs(num) {
  var prevNumber = 0;
  var currNumber = 1;
  var result = 0;
  while (currNumber <= num) {
    if (currNumber % 2 !== 0) {
      result += currNumber;
    }

    currNumber += prevNumber;
    prevNumber = currNumber - prevNumber;
  }

  return result;
}

// test here
sumFibs(4);