App Object.js

var app = {
    db: {},
    next_id: 0,
    create: function(newThing) {

        if(newThing !== ''){
        this.db[this.next_id] = newThing;
        this.next_id ++;
          return 'NEW OBJECT WAS CREATED' ;
        }else{
          return 'Error';
        }

    },
    read: function(ID) {
        if(this.db[ID]){
        return this.db[ID] ; 
        } else {
         return 'NOT FOUND' ;  
        }
    },
    update: function(ID, new_value) {
        
        if(new_value && this.db[ID]){
          this.db[ID] = new_value;
          return 'THING WAS UPDATED';
        }else if (!this.db[ID]){
          return 'unknown ID'; 
        }else if(!new_value){
          return 'invalid input'; 
        } else {
          return'ALL BAD';
        }
    },
    
    delete: function(ID) {
      if(this.db[ID]){
            this.db[ID] = undefined,
          console.log('APP WAS DELETED');
        } else{
          console.log('UNKNOWN ID');
        }
    }
};

app.create('lol');
console.log(app.db);
console.log(app.update(0,'ololo'));
console.log(app.update('ololo'));
console.log(app.update(0));
console.log(app.db);