Recursive fibonacci sequence

fib.js

function fib(prev=[], loop=100, cb=function(){}) {
  if(!prev.length){
    prev.unshift(0);
    prev.unshift(1);
  }
  prev.unshift(prev[1] + prev[0]);
  cb(prev);
  if(loop === 0){
    return prev;
  }
  return fib(prev,(loop-1));
}

console.log(fib());