Fibonacci loop

fibo_loop.js

function fibonacci(num){
  var a = 1, b = 0, temp;

  while (num >= 0){
    temp = a;
    a = a + b;
    b = temp;
    num--;
  }

  return b;
}

Why is your Fibonacci algorithm (0) equal to 1, but not 0?
In other sources I have seen "...while(num >= 1)...".
How it will be correct?

@shubich I was wondering the same thing. I guess if you change line 4 to "while (num > 0){" it will be correct.

This version doesn't require a temp variable
function fibonacci(num) {
var i = 1, j = 0
while (num >= 1) {
j = i + j
i = j - i
num--
console.log(j)
}
//return (j)
}

fibonacci(10)