/*
    (4)        .-> 2 + 1 = 3
     |        /        |
     '------>(3)+(2)<-'
             |^
             |'---- 2 = 1 + 1 <-.
 1st step -> |          ^       |
             |          |       |
             '----->(2)-' + (1)-'
*/

(fib=n=>{var a=1,b=0,temp; while(n>=0){temp=a;a=a+b;b=temp;n--;console.log(a)}return b})(100);