Storing a collection of unique functions

UniqueFuncsCollections.md

var store = {
  nextId: 1,
  cache: {},
  add: function(fn) {
     if (!fn.id) {
        fn.id = this.nextId++;
        this.cache[fn.id] = fn;
        return true;
     }
  }
}

// usage 
// function ninja(){}
// store.add(ninja);