Function and procedure implementations are the executable code in a unit. The implementations of functions/procedures are added to the implementation section of a unit and consist of a variable declaration block, if necessary, followed by a code block:

procedure MyProcedure;
var
   MyVariable: String;
   MyOtherVariable: Integer;
begin
   // Code block
end;

The variable declarations follow the same declaration rules as the var clause in a unit. Please see the Variable Declarations topic for more information.

A code block consists of a begin keyword followed by a series of statements and an end keyword. The code block that is used in a function or procedure implementation is always terminated with a statement terminator (;). However, code blocks can be nested within other statements, such as conditional if statements. In such cases, please refer to the documentation on the statement to determine if a statement terminator is necessary after the end keyword at the end of a code block.

Returning Results From a Function

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Procedures do not return a result, whereas functions do. Every function has an implicit Result variable that can be assigned a value that is returned as the result of the function:

function MyFunction(const MyParameter: String): String;
begin
   Result := 'The parameter value is ' + MyParameter;
end;

The type of the Result variable is determined by the type declaration for the function's return value.