Function decorators

memoize.js

  _.memoize = function(func) {
    var history = {};
    /* PSEUDO CODE
     check if func & arguments in history
     if they are:  look up the stored return value
     if not:  run it with 'once' and store it in 'history' as an object with 3 properties:
     
       history = {
        {
          function: ____,
          arguments: _____,
          returnedValue: _____
        }
      }
      */
  
    // failing function - attempting to access arguments in this closure
     return _.once(function(){
       return func.call(null, arguments);
    });
  };