js snippt

js snippt

hasher || (hasher = _.identity);


_.memoize = function(func, hasher) {
  var memo = {};
  hasher || (hasher = _.identity);
  return function() {
    var key = hasher.apply(this, arguments);//Good
    return _.has(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
  };
};