karasco

## state-interaction.md

      
        
          
            
              
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                thieux
                / state-interaction.md
            
            
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              August 9, 2017 09:15
            
              
                State versus interaction - design strategies & tests
              
          
        
      
        
  
      
    Pattern

The input (that feeds a function) can be implemented in 2 ways: controlled by the caller or by the callee.
The outputs (that is provided by a function) can be implemented in 2 ways: exposed to the caller or by message.
Input as parameter

The function's caller controls the input.