memfactorial

gistfile1.js

function memfactorial(n){

     if(!memfactorial.cache){
          memfactorial.cache = {
               '0': 1,
               '1': 1
          };
     }

     if(!memfactorial.cache.hasOwnProperty(n)){
          memfactorial.cache[n] = n * memfactorial(n-1);
     }

     return memfactorial.cache[n];
    
}