different fibs

fib.js

/* jshint esnext: true */
var input = parseInt(process.argv[2]);
var iterations = Number.isNaN(input) ? 10 : input;
console.log('%d iterations', iterations);

var fib = function(iter){
  var state;
  state = { curr: 1, last: 0 };
  for(var i=0; i<iter-1; i++){
    state = {
      last : state.curr,
      curr : state.last + state.curr
    };
  }
  return state;
};

console.log(fib(iterations));

var indent = '';
fib = function(iter, acc){
  indent = indent.concat(' ');
  if(!Array.isArray(acc)){
    iter--;
    acc = [1, 0];
  }

  if(iter === 0){
    return acc;
  }
  return fib(--iter, [ acc.reduce(add) , acc[0]]);
};

console.log(fib(iterations));

function add(a,b){ return a+b; }