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JavaScript (Grammar (Strings (immutable (use + operator to concatenate),…

- - - - Use isNaN(number) to detect it
  - - - use + operator to concatenate
  - - - Keys: any string including the empty string
      - Value: any value except fot undefined
    - - var empty_obj = {};
      - var stooge = { "first-name" : "Jerome", "second-name" : "Howard" };
      - var user = { "name" : "Ale", "address" : { "zip" : 20060, "country" : "Italy" } }
      - Retrieval
        
        stooge["first-name"]; // "Jerome" user.address.country; // "Italy"
        
        || for default values
      - Update
        
        by assignment
        
        augmented if property doesn't exist
      - Reference
        
        objects always passed by reference, never copied