memoize_fibonacci_obj_prop.js

var Fib = {
   compute: function(n) {    
     return n < 2 ? 1 : Fib.compute(n-1)+Fib.compute(n-2)
   }
}

function memoize(obj,prop) {
  var cache = {}
  var fn = obj[prop]
  return function(x) {
    if (x in cache) {
      console.log('retrieved value from cache for', x)
    }
    return x in cache ? cache[x] :cache[x] = fn(x)
  }
  
}


Fib.compute = memoize(Fib, "compute")


console.log(Fib.compute(1))
console.log(Fib.compute(4))
console.log(Fib.compute(5))