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Function Structure (Arguments (3 is Max, 2 is ideal, No Output Arguments,…

- - - - But Side effects are parts of a system. Side effects should just be managed and be imposed a strict discipline
      - side effects can be managed
        
        Command Query Separations
        
        Functions that changes state, should not return a value. But they can throw exceptions
        
        Functions that returns a value should not change state.
        
        Tell Don't Ask
        
        Tell what to do. But don't ask for its state. Because we don't want it to make decision based on the state that it have.
        
        violation of this
        
        o.getX().getY().getZ().doSomething();
        
        it should be like this
        
        1 more item...
        
        called trainwrecks
        
        also violates
        
        1 more item...
  - - - Selection
      - Iteration
      - Sequence
- - - - open(File f, Command c) { f.open(); c(); f.close() }