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    Add expressions
    
    

    
    

    
    

    
    
    
    

    



    

        Add expressions

        Add expressions are used to add 2 values.

            An add expression is a code fragment which produces a value, whose type is determined by the values being added, and which can then be used as an input for other operations: print, write, method call and so forth.

            An add expression has the form a + b.

        
        Add expressions are sometimes commutative, but not always. Adding numbers is commutative, but adding Texts is not.

            However, to help in programming, Prompto supports implicit commutation, where if a + b does not make sense, it will treat it as b + a.

        
        
            Adding Text or Character values and other values
        
        Adding a Text or Character value a and any other value b is legal if b has a textual representation.

            It returns a Text value, concatenating a and b.
        

        
            
        

        
            Adding Integer and Decimal values
        
        Adding Integer and Decimal values returns an Integer value if both values are Integer, and a Decimal otherwise.

        

        
            
        

        
            Adding Date and Period values
        
        Adding Date and Period values returns a Date value, the Time section of the Period value is ignored.

        

        
            
        

        
            Adding Time and Period values
        
        Adding Time and Period values returns a Time value, the Date section of the Period value is ignored.

        

        
            
        

        
            Adding DateTime and Period values
        
        Adding DateTime and Period values returns a DateTime value.

        

        
            
        

        
            Adding Period and Period values
        
        Adding Period and Period values returns a Period value.

        

        
            
        

        
            Adding List and List or Set values
        
        Adding List and List or Set values is legal if both collections have the same item type. It returns a List value.

        

        
            
        

        
            Adding Set and List or Set values
        
        Adding Set and List or Set values is legal if both collections have the same item type. It returns a Set value.

        

        
            
        
        
            Adding Tuple and Tuple, List or Set values
        
        Adding Tuple and Tuple, List or Set values returns a Tuple value.

        

        
            
        

        
            Adding Dictionary and Dictionary values
        
        Adding Dictionary and Dictionary values is legal if both collections have the same item type. It returns a Dictionary value.

            The items in the right-hand value supersede the items in the left-hand value if they have the same key.
        

        
            
        

        
        Adding user defined values

        Prompto supports adding user defined values. See categories for details.